[PATCH v6, part3 00/16] accurately calculate memory statisitic information

[PATCH v6, part3 00/16] accurately calculate memory statisitic information

[Jiang Liu]

The original goal of this patchset is to fix the bug reported by
https://bugzilla.kernel.org/show_bug.cgi?id=53501
Now it has also been expanded to reduce common code used by memory
initializion.

This is the third part, previous two patch sets have been merged into
the main stream kernel and could also be accessed at:
http://marc.info/?l=linux-mm&m=136289696323825&w=2
http://marc.info/?l=linux-mm&m=136290291524901&w=2

This patchset applies to
git://git.cmpxchg.org/linux-mmotm.git v3.9-rc8-mmotm-2013-04-25-16-24

V2->V4:
1) rebase to git://git.cmpxchg.org/linux-mmotm.git
2) fix some build warnings and other minor bugs of previous patches

V4->V5:
1) rebase to v3.9-rc8-mmotm-2013-04-25-16-24
2) address comments from last round of review

V5->V6:
1) Change signature of free_reserved_area() according to Russell King's
   suggestion to fix following build warnings.
2) rebase to v3.9-mmotm-2013-05-09-15-57

We have only tested these patchset on x86 platforms, and have done basic
compliation tests using cross-compilers from ftp.kernel.org. That means
some code may not pass compilation on some architectures. So any help
to test this patchset are welcomed!

Patch 1-7:
	Bugfixes and more work for part1 and part2
Patch 8-9:
	Fix typo and minor bugs in mm core
Patch 10-14:
	Enhance the way to manage totalram_pages, totalhigh_pages and
	zone->managed_pages.
Patch 15:
	Report available pages within the node as "MemTotal" for sysfs
	interface /sys/.../node/nodex/meminfo
Patch 16:
	A minor fix for AVR32 related to HZ

Jiang Liu (16):
  mm: change signature of free_reserved_area() to fix building warnings
  mm: enhance free_reserved_area() to support poisoning memory with zero
  mm/ARM64: kill poison_init_mem()
  mm/x86: use free_reserved_area() to simplify code
  mm/tile: use common help functions to free reserved pages
  mm, powertv: use free_reserved_area() to simplify code
  mm, acornfb: use free_reserved_area() to simplify code
  mm: fix some trivial typos in comments
  mm: use managed_pages to calculate default zonelist order
  mm: accurately calculate zone->managed_pages for highmem zones
  mm: use a dedicated lock to protect totalram_pages and
    zone->managed_pages
  mm: make __free_pages_bootmem() only available at boot time
  mm: correctly update zone->mamaged_pages
  mm: concentrate modification of totalram_pages into the mm core
  mm: report available pages as "MemTotal" for each NUMA node
  AVR32: fix building warnings caused by redifinitions of HZ

 arch/alpha/kernel/sys_nautilus.c      |  4 +--
 arch/alpha/mm/init.c                  |  6 ++--
 arch/alpha/mm/numa.c                  |  2 +-
 arch/arc/mm/init.c                    |  6 ++--
 arch/arm/mm/init.c                    | 11 +++----
 arch/arm64/mm/init.c                  | 17 ++--------
 arch/avr32/include/uapi/asm/param.h   |  6 +++-
 arch/avr32/mm/init.c                  |  6 ++--
 arch/blackfin/mm/init.c               |  6 ++--
 arch/c6x/mm/init.c                    |  6 ++--
 arch/cris/mm/init.c                   |  4 +--
 arch/frv/mm/init.c                    |  6 ++--
 arch/h8300/mm/init.c                  |  6 ++--
 arch/hexagon/mm/init.c                |  2 +-
 arch/ia64/mm/init.c                   |  7 ++--
 arch/m32r/mm/init.c                   |  6 ++--
 arch/m68k/mm/init.c                   |  8 ++---
 arch/metag/mm/init.c                  | 14 +++++---
 arch/microblaze/mm/init.c             |  6 ++--
 arch/mips/mm/init.c                   |  5 +--
 arch/mips/powertv/asic/asic_devices.c | 13 ++------
 arch/mips/sgi-ip27/ip27-memory.c      |  2 +-
 arch/mn10300/mm/init.c                |  5 +--
 arch/openrisc/mm/init.c               |  6 ++--
 arch/parisc/mm/init.c                 |  9 ++---
 arch/powerpc/kernel/kvm.c             |  9 ++---
 arch/powerpc/mm/mem.c                 |  7 ++--
 arch/s390/mm/init.c                   |  7 ++--
 arch/score/mm/init.c                  |  5 +--
 arch/sh/mm/init.c                     |  6 ++--
 arch/sparc/mm/init_32.c               |  7 ++--
 arch/sparc/mm/init_64.c               |  6 ++--
 arch/tile/mm/init.c                   |  9 ++---
 arch/um/kernel/mem.c                  |  4 +--
 arch/unicore32/mm/init.c              |  6 ++--
 arch/x86/mm/highmem_32.c              |  6 ++++
 arch/x86/mm/init.c                    | 14 ++------
 arch/x86/mm/init_32.c                 |  2 +-
 arch/x86/mm/init_64.c                 | 25 +++-----------
 arch/xtensa/mm/init.c                 |  6 ++--
 drivers/video/acornfb.c               | 28 ++--------------
 drivers/virtio/virtio_balloon.c       |  8 +++--
 drivers/xen/balloon.c                 | 23 +++----------
 include/linux/bootmem.h               |  1 +
 include/linux/mm.h                    | 18 +++++-----
 include/linux/mmzone.h                | 14 +++++---
 mm/bootmem.c                          | 41 ++++++++++++++---------
 mm/hugetlb.c                          |  2 +-
 mm/memory_hotplug.c                   | 33 ++++---------------
 mm/nobootmem.c                        | 35 ++++++++++++--------
 mm/page_alloc.c                       | 62 ++++++++++++++++++++---------------
 51 files changed, 246 insertions(+), 307 deletions(-)

-- 
1.8.1.2

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[PATCH v6, part3 01/16] mm: change signature of free_reserved_area() to fix building warnings

[Jiang Liu]

Change signature of free_reserved_area() according to Russell King's
suggestion to fix following build warnings:

arch/arm/mm/init.c: In function 'mem_init':
arch/arm/mm/init.c:603:2: warning: passing argument 1 of 'free_reserved_area' makes integer from pointer without a cast [enabled by default]
  free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
  ^
In file included from include/linux/mman.h:4:0,
                 from arch/arm/mm/init.c:15:
include/linux/mm.h:1301:22: note: expected 'long unsigned int' but argument is of type 'void *'
 extern unsigned long free_reserved_area(unsigned long start, unsigned long end,

   mm/page_alloc.c: In function 'free_reserved_area':
>> mm/page_alloc.c:5134:3: warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast [enabled by default]
   In file included from arch/mips/include/asm/page.h:49:0,
                    from include/linux/mmzone.h:20,
                    from include/linux/gfp.h:4,
                    from include/linux/mm.h:8,
                    from mm/page_alloc.c:18:
   arch/mips/include/asm/io.h:119:29: note: expected 'const volatile void *' but argument is of type 'long unsigned int'
   mm/page_alloc.c: In function 'free_area_init_nodes':
   mm/page_alloc.c:5030:34: warning: array subscript is below array bounds [-Warray-bounds]

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
 arch/alpha/kernel/sys_nautilus.c |  4 ++--
 arch/alpha/mm/init.c             |  2 +-
 arch/arc/mm/init.c               |  2 +-
 arch/arm/mm/init.c               |  2 +-
 arch/arm64/mm/init.c             |  2 +-
 arch/avr32/mm/init.c             |  2 +-
 arch/blackfin/mm/init.c          |  2 +-
 arch/c6x/mm/init.c               |  2 +-
 arch/frv/mm/init.c               |  2 +-
 arch/h8300/mm/init.c             |  2 +-
 arch/ia64/mm/init.c              |  3 +--
 arch/m32r/mm/init.c              |  2 +-
 arch/m68k/mm/init.c              |  2 +-
 arch/metag/mm/init.c             |  3 ++-
 arch/microblaze/mm/init.c        |  2 +-
 arch/mips/mm/init.c              |  3 ++-
 arch/mn10300/mm/init.c           |  3 ++-
 arch/openrisc/mm/init.c          |  2 +-
 arch/parisc/mm/init.c            |  3 ++-
 arch/powerpc/kernel/kvm.c        |  2 +-
 arch/powerpc/mm/mem.c            |  2 +-
 arch/s390/mm/init.c              |  3 ++-
 arch/score/mm/init.c             |  3 ++-
 arch/sh/mm/init.c                |  2 +-
 arch/sparc/mm/init_32.c          |  4 ++--
 arch/sparc/mm/init_64.c          |  4 ++--
 arch/um/kernel/mem.c             |  2 +-
 arch/unicore32/mm/init.c         |  2 +-
 arch/xtensa/mm/init.c            |  2 +-
 include/linux/mm.h               |  5 ++---
 mm/page_alloc.c                  | 16 ++++++++--------
 31 files changed, 48 insertions(+), 44 deletions(-)

diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
index 1d4aabf..891bd27 100644
--- a/arch/alpha/kernel/sys_nautilus.c
+++ b/arch/alpha/kernel/sys_nautilus.c
@@ -238,8 +238,8 @@ nautilus_init_pci(void)
 	if (pci_mem < memtop)
 		memtop = pci_mem;
 	if (memtop > alpha_mv.min_mem_address) {
-		free_reserved_area((unsigned long)__va(alpha_mv.min_mem_address),
-				   (unsigned long)__va(memtop), 0, NULL);
+		free_reserved_area(__va(alpha_mv.min_mem_address),
+				   __va(memtop), 0, NULL);
 		printk("nautilus_init_pci: %ldk freed\n",
 			(memtop - alpha_mv.min_mem_address) >> 10);
 	}
diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index 0ba85ee..d54848d 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -326,6 +326,6 @@ free_initmem(void)
 void
 free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 4a17736..dce02e4 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -152,7 +152,7 @@ void __init_refok free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 9a5cdc0..59d6f76 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -744,7 +744,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		free_reserved_area(start, end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, 0, "initrd");
 	}
 }
 
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f497ca7..6041e40 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -398,7 +398,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		free_reserved_area(start, end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, 0, "initrd");
 	}
 }
 
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index e66e840..5a79fa0 100644
--- a/arch/avr32/mm/init.c
+++ b/arch/avr32/mm/init.c
@@ -154,6 +154,6 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 82d01a7..8e9eab2 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -133,7 +133,7 @@ void __init mem_init(void)
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 #ifndef CONFIG_MPU
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 #endif
 }
 #endif
diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c
index a9fcd89..97914e5 100644
--- a/arch/c6x/mm/init.c
+++ b/arch/c6x/mm/init.c
@@ -77,7 +77,7 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
index dee354f..a67f3a5 100644
--- a/arch/frv/mm/init.c
+++ b/arch/frv/mm/init.c
@@ -173,6 +173,6 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 } /* end free_initrd_mem() */
 #endif
diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c
index ff349d7..57e03c5 100644
--- a/arch/h8300/mm/init.c
+++ b/arch/h8300/mm/init.c
@@ -161,7 +161,7 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index d1fe4b4..da568c2 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -154,8 +154,7 @@ ia64_init_addr_space (void)
 void
 free_initmem (void)
 {
-	free_reserved_area((unsigned long)ia64_imva(__init_begin),
-			   (unsigned long)ia64_imva(__init_end),
+	free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
 			   0, "unused kernel");
 }
 
diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c
index ab4cbce..d80412d 100644
--- a/arch/m32r/mm/init.c
+++ b/arch/m32r/mm/init.c
@@ -191,6 +191,6 @@ void free_initmem(void)
  *======================================================================*/
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index 1af2ca3..95de725 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -202,6 +202,6 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
index d05b845..5e2238d 100644
--- a/arch/metag/mm/init.c
+++ b/arch/metag/mm/init.c
@@ -414,7 +414,8 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
 }
 #endif
 
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index b38ae3a..d7b8ada 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -235,7 +235,7 @@ void __init setup_memory(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 9b973e0..268f2a9 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -440,7 +440,8 @@ void free_init_pages(const char *what, unsigned long begin, unsigned long end)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
 }
 #endif
 
diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
index 5a8ace6..e19049d 100644
--- a/arch/mn10300/mm/init.c
+++ b/arch/mn10300/mm/init.c
@@ -152,6 +152,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
 }
 #endif
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index b3cbc67..ab11332 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -261,7 +261,7 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index ce939ac..59cec60 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -1101,6 +1101,7 @@ void flush_tlb_all(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	num_physpages += free_reserved_area(start, end, 0, "initrd");
+	num_physpages += free_reserved_area((void *)start, (void *)end, 0,
+					    "initrd");
 }
 #endif
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 6782221..5e4830a 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -756,7 +756,7 @@ static __init void kvm_free_tmp(void)
 	end = (ulong)&kvm_tmp[ARRAY_SIZE(kvm_tmp)] & PAGE_MASK;
 
 	/* Free the tmp space we don't need */
-	free_reserved_area(start, end, 0, NULL);
+	free_reserved_area((void *)start, (void *)end, 0, NULL);
 }
 
 static int __init kvm_guest_init(void)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0988a26..347c5b1 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -407,7 +407,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 89ebae4..0878c89 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -172,7 +172,8 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
 }
 #endif
 
diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c
index d8f988a..3d79ecb 100644
--- a/arch/score/mm/init.c
+++ b/arch/score/mm/init.c
@@ -110,7 +110,8 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
 }
 #endif
 
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 20f9ead..b892a9b 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -505,7 +505,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index af472cf..d5f9c02 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -372,8 +372,8 @@ void free_initmem (void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	num_physpages += free_reserved_area(start, end, POISON_FREE_INITMEM,
-					    "initrd");
+	num_physpages += free_reserved_area((void *)start, (void *)end,
+					    POISON_FREE_INITMEM, "initrd");
 }
 #endif
 
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index a717199..a54cdcd 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2124,8 +2124,8 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	num_physpages += free_reserved_area(start, end, POISON_FREE_INITMEM,
-					    "initrd");
+	num_physpages += free_reserved_area((void *)start, (void *)end,
+					    POISON_FREE_INITMEM, "initrd");
 }
 #endif
 
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 9df292b..2aa7a24 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -244,7 +244,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area(start, end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index 63df12d..220755c 100644
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -486,7 +486,7 @@ static int keep_initrd;
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd)
-		free_reserved_area(start, end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 
 static int __init keepinitrd_setup(char *__unused)
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index bba125b..4d658ef 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -214,7 +214,7 @@ extern int initrd_is_mapped;
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (initrd_is_mapped)
-		free_reserved_area(start, end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 #endif
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e0c8528..771769f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1307,7 +1307,7 @@ extern void free_initmem(void);
  * "poison" if it's non-zero.
  * Return pages freed into the buddy system.
  */
-extern unsigned long free_reserved_area(unsigned long start, unsigned long end,
+extern unsigned long free_reserved_area(void *start, void *end,
 					int poison, char *s);
 #ifdef	CONFIG_HIGHMEM
 /*
@@ -1351,8 +1351,7 @@ static inline unsigned long free_initmem_default(int poison)
 {
 	extern char __init_begin[], __init_end[];
 
-	return free_reserved_area(PAGE_ALIGN((unsigned long)&__init_begin) ,
-				  ((unsigned long)&__init_end) & PAGE_MASK,
+	return free_reserved_area(&__init_begin, &__init_end,
 				  poison, "unused kernel");
 }
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 34d42dc..9fe3061 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5188,21 +5188,21 @@ early_param("movablecore", cmdline_parse_movablecore);
 
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
-unsigned long free_reserved_area(unsigned long start, unsigned long end,
-				 int poison, char *s)
+unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
 {
-	unsigned long pages, pos;
+	void *pos;
+	unsigned long pages = 0;
 
-	pos = start = PAGE_ALIGN(start);
-	end &= PAGE_MASK;
-	for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
+	start = (void *)PAGE_ALIGN((unsigned long)start);
+	end = (void *)((unsigned long)end & PAGE_MASK);
+	for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
 		if (poison)
-			memset((void *)pos, poison, PAGE_SIZE);
+			memset(pos, poison, PAGE_SIZE);
 		free_reserved_page(virt_to_page(pos));
 	}
 
 	if (pages && s)
-		pr_info("Freeing %s memory: %ldK (%lx - %lx)\n",
+		pr_info("Freeing %s memory: %ldK (%p - %p)\n",
 			s, pages << (PAGE_SHIFT - 10), start, end);
 
 	return pages;
-- 
1.8.1.2

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[PATCH v6, part3 02/16] mm: enhance free_reserved_area() to support poisoning memory with zero

[Jiang Liu]

Address more review comments from last round of code review.
1) Enhance free_reserved_area() to support poisoning freed memory with
   pattern '0'. This could be used to get rid of poison_init_mem()
   on ARM64.
2) A previous patch has disabled memory poison for initmem on s390
   by mistake, so restore to the original behavior.
3) Remove redundant PAGE_ALIGN() when calling free_reserved_area().

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
---
 arch/alpha/kernel/sys_nautilus.c | 2 +-
 arch/alpha/mm/init.c             | 4 ++--
 arch/arc/mm/init.c               | 4 ++--
 arch/arm/mm/init.c               | 8 ++++----
 arch/arm64/mm/init.c             | 4 ++--
 arch/avr32/mm/init.c             | 4 ++--
 arch/blackfin/mm/init.c          | 4 ++--
 arch/c6x/mm/init.c               | 4 ++--
 arch/cris/mm/init.c              | 2 +-
 arch/frv/mm/init.c               | 4 ++--
 arch/h8300/mm/init.c             | 4 ++--
 arch/ia64/mm/init.c              | 2 +-
 arch/m32r/mm/init.c              | 4 ++--
 arch/m68k/mm/init.c              | 4 ++--
 arch/microblaze/mm/init.c        | 4 ++--
 arch/openrisc/mm/init.c          | 4 ++--
 arch/parisc/mm/init.c            | 4 ++--
 arch/powerpc/kernel/kvm.c        | 9 ++-------
 arch/powerpc/mm/mem.c            | 2 +-
 arch/s390/mm/init.c              | 2 +-
 arch/sh/mm/init.c                | 4 ++--
 arch/um/kernel/mem.c             | 2 +-
 arch/unicore32/mm/init.c         | 4 ++--
 arch/xtensa/mm/init.c            | 4 ++--
 include/linux/mm.h               | 7 ++++---
 mm/page_alloc.c                  | 2 +-
 26 files changed, 49 insertions(+), 53 deletions(-)

diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
index 891bd27..837c0fa 100644
--- a/arch/alpha/kernel/sys_nautilus.c
+++ b/arch/alpha/kernel/sys_nautilus.c
@@ -239,7 +239,7 @@ nautilus_init_pci(void)
 		memtop = pci_mem;
 	if (memtop > alpha_mv.min_mem_address) {
 		free_reserved_area(__va(alpha_mv.min_mem_address),
-				   __va(memtop), 0, NULL);
+				   __va(memtop), -1, NULL);
 		printk("nautilus_init_pci: %ldk freed\n",
 			(memtop - alpha_mv.min_mem_address) >> 10);
 	}
diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index d54848d..218c29c 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -319,13 +319,13 @@ mem_init(void)
 void
 free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void
 free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index dce02e4..f9c7077 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -146,13 +146,13 @@ void __init mem_init(void)
  */
 void __init_refok free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 59d6f76..f223394 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -600,7 +600,7 @@ void __init mem_init(void)
 
 #ifdef CONFIG_SA1111
 	/* now that our DMA memory is actually so designated, we can free it */
-	free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
+	free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, -1, NULL);
 #endif
 
 	free_highpages();
@@ -728,12 +728,12 @@ void free_initmem(void)
 	extern char __tcm_start, __tcm_end;
 
 	poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
-	free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link");
+	free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
 #endif
 
 	poison_init_mem(__init_begin, __init_end - __init_begin);
 	if (!machine_is_integrator() && !machine_is_cintegrator())
-		free_initmem_default(0);
+		free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -744,7 +744,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		free_reserved_area((void *)start, (void *)end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, -1, "initrd");
 	}
 }
 
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 6041e40..997c634 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -387,7 +387,7 @@ void __init mem_init(void)
 void free_initmem(void)
 {
 	poison_init_mem(__init_begin, __init_end - __init_begin);
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -398,7 +398,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		free_reserved_area((void *)start, (void *)end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, -1, "initrd");
 	}
 }
 
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index 5a79fa0..b079e04 100644
--- a/arch/avr32/mm/init.c
+++ b/arch/avr32/mm/init.c
@@ -148,12 +148,12 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 8e9eab2..fa241f5 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -133,7 +133,7 @@ void __init mem_init(void)
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 #ifndef CONFIG_MPU
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 #endif
 }
 #endif
@@ -141,7 +141,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
 void __init_refok free_initmem(void)
 {
 #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
-	free_initmem_default(0);
+	free_initmem_default(-1);
 	if (memory_start == (unsigned long)(&__init_end))
 		memory_start = (unsigned long)(&__init_begin);
 #endif
diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c
index 97914e5..7f25bef 100644
--- a/arch/c6x/mm/init.c
+++ b/arch/c6x/mm/init.c
@@ -77,11 +77,11 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
 void __init free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c
index 9ac8094..8fec263 100644
--- a/arch/cris/mm/init.c
+++ b/arch/cris/mm/init.c
@@ -65,5 +65,5 @@ mem_init(void)
 void 
 free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
index a67f3a5..8ba9d22 100644
--- a/arch/frv/mm/init.c
+++ b/arch/frv/mm/init.c
@@ -162,7 +162,7 @@ void __init mem_init(void)
 void free_initmem(void)
 {
 #if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
-	free_initmem_default(0);
+	free_initmem_default(-1);
 #endif
 } /* end free_initmem() */
 
@@ -173,6 +173,6 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 } /* end free_initrd_mem() */
 #endif
diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c
index 57e03c5..c831f1d 100644
--- a/arch/h8300/mm/init.c
+++ b/arch/h8300/mm/init.c
@@ -161,7 +161,7 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
@@ -169,7 +169,7 @@ void
 free_initmem(void)
 {
 #ifdef CONFIG_RAMKERNEL
-	free_initmem_default(0);
+	free_initmem_default(-1);
 #endif
 }
 
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index da568c2..f8a4f38 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -155,7 +155,7 @@ void
 free_initmem (void)
 {
 	free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
-			   0, "unused kernel");
+			   -1, "unused kernel");
 }
 
 void __init
diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c
index d80412d..cca87d9 100644
--- a/arch/m32r/mm/init.c
+++ b/arch/m32r/mm/init.c
@@ -181,7 +181,7 @@ void __init mem_init(void)
  *======================================================================*/
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -191,6 +191,6 @@ void free_initmem(void)
  *======================================================================*/
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index 95de725..ab0b54c 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -110,7 +110,7 @@ void __init paging_init(void)
 void free_initmem(void)
 {
 #ifndef CONFIG_MMU_SUN3
-	free_initmem_default(0);
+	free_initmem_default(-1);
 #endif /* CONFIG_MMU_SUN3 */
 }
 
@@ -202,6 +202,6 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index d7b8ada..d149e0e 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -235,13 +235,13 @@ void __init setup_memory(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 void __init mem_init(void)
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index ab11332..c371e4a 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -261,11 +261,11 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 59cec60..aaa1fbc 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -532,7 +532,7 @@ void free_initmem(void)
 	 * pages are no-longer executable */
 	flush_icache_range(init_begin, init_end);
 	
-	num_physpages += free_initmem_default(0);
+	num_physpages += free_initmem_default(-1);
 
 	/* set up a new led state on systems shipped LED State panel */
 	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
@@ -1101,7 +1101,7 @@ void flush_tlb_all(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	num_physpages += free_reserved_area((void *)start, (void *)end, 0,
+	num_physpages += free_reserved_area((void *)start, (void *)end, -1,
 					    "initrd");
 }
 #endif
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 5e4830a..db28032 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -750,13 +750,8 @@ EXPORT_SYMBOL_GPL(kvm_hypercall);
 
 static __init void kvm_free_tmp(void)
 {
-	unsigned long start, end;
-
-	start = (ulong)&kvm_tmp[kvm_tmp_index + (PAGE_SIZE - 1)] & PAGE_MASK;
-	end = (ulong)&kvm_tmp[ARRAY_SIZE(kvm_tmp)] & PAGE_MASK;
-
-	/* Free the tmp space we don't need */
-	free_reserved_area((void *)start, (void *)end, 0, NULL);
+	free_reserved_area(&kvm_tmp[kvm_tmp_index],
+			   &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL);
 }
 
 static int __init kvm_guest_init(void)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 347c5b1..7f47a05 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -407,7 +407,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 0878c89..bf01d18 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -166,7 +166,7 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(POISON_FREE_INITMEM);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index b892a9b..d3af56b 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -499,13 +499,13 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 2aa7a24..8ff0b7a 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -244,7 +244,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_area((void *)start, (void *)end, 0, "initrd");
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index 220755c..df9b8ab 100644
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -476,7 +476,7 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -486,7 +486,7 @@ static int keep_initrd;
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd)
-		free_reserved_area((void *)start, (void *)end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 
 static int __init keepinitrd_setup(char *__unused)
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 4d658ef..026d29b 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -214,11 +214,11 @@ extern int initrd_is_mapped;
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (initrd_is_mapped)
-		free_reserved_area((void *)start, (void *)end, 0, "initrd");
+		free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif
 
 void free_initmem(void)
 {
-	free_initmem_default(0);
+	free_initmem_default(-1);
 }
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 771769f..a56bcaa 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1304,7 +1304,7 @@ extern void free_initmem(void);
 /*
  * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
  * into the buddy system. The freed pages will be poisoned with pattern
- * "poison" if it's non-zero.
+ * "poison" if it's within range [0, UCHAR_MAX].
  * Return pages freed into the buddy system.
  */
 extern unsigned long free_reserved_area(void *start, void *end,
@@ -1344,8 +1344,9 @@ static inline void mark_page_reserved(struct page *page)
 
 /*
  * Default method to free all the __init memory into the buddy system.
- * The freed pages will be poisoned with pattern "poison" if it is
- * non-zero. Return pages freed into the buddy system.
+ * The freed pages will be poisoned with pattern "poison" if it's within
+ * range [0, UCHAR_MAX].
+ * Return pages freed into the buddy system.
  */
 static inline unsigned long free_initmem_default(int poison)
 {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9fe3061..13e566a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5196,7 +5196,7 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
 	start = (void *)PAGE_ALIGN((unsigned long)start);
 	end = (void *)((unsigned long)end & PAGE_MASK);
 	for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
-		if (poison)
+		if ((unsigned int)poison <= 0xFF)
 			memset(pos, poison, PAGE_SIZE);
 		free_reserved_page(virt_to_page(pos));
 	}
-- 
1.8.1.2

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[PATCH v6, part3 03/16] mm/ARM64: kill poison_init_mem()

[Jiang Liu]

Use free_reserved_area() to poison initmem memory pages and kill
poison_init_mem() on ARM64.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
 arch/arm64/mm/init.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 997c634..a398eb9 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -197,14 +197,6 @@ void __init bootmem_init(void)
 	max_pfn = max_low_pfn = max;
 }
 
-/*
- * Poison init memory with an undefined instruction (0x0).
- */
-static inline void poison_init_mem(void *s, size_t count)
-{
-	memset(s, 0, count);
-}
-
 #ifndef CONFIG_SPARSEMEM_VMEMMAP
 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 {
@@ -386,8 +378,7 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	poison_init_mem(__init_begin, __init_end - __init_begin);
-	free_initmem_default(-1);
+	free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -396,10 +387,8 @@ static int keep_initrd;
 
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	if (!keep_initrd) {
-		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		free_reserved_area((void *)start, (void *)end, -1, "initrd");
-	}
+	if (!keep_initrd)
+		free_reserved_area((void *)start, (void *)end, 0, "initrd");
 }
 
 static int __init keepinitrd_setup(char *__unused)
-- 
1.8.1.2

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[PATCH v6, part3 04/16] mm/x86: use free_reserved_area() to simplify code

[Jiang Liu]

Use common help function free_reserved_area() to simplify code.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: linux-kernel@vger.kernel.org
---
 arch/x86/mm/init.c    | 14 +++-----------
 arch/x86/mm/init_64.c |  5 ++---
 2 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index fed9993..9048d94 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -494,7 +494,6 @@ int devmem_is_allowed(unsigned long pagenr)
 
 void free_init_pages(char *what, unsigned long begin, unsigned long end)
 {
-	unsigned long addr;
 	unsigned long begin_aligned, end_aligned;
 
 	/* Make sure boundaries are page aligned */
@@ -509,8 +508,6 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 	if (begin >= end)
 		return;
 
-	addr = begin;
-
 	/*
 	 * If debugging page accesses then do not free this memory but
 	 * mark them not present - any buggy init-section access will
@@ -529,18 +526,13 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 	set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
 	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
 
-	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-
-	for (; addr < end; addr += PAGE_SIZE) {
-		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
-		free_reserved_page(virt_to_page(addr));
-	}
+	free_reserved_area(begin, end, POISON_FREE_INITMEM, what);
 #endif
 }
 
 void free_initmem(void)
 {
-	free_init_pages("unused kernel memory",
+	free_init_pages("unused kernel",
 			(unsigned long)(&__init_begin),
 			(unsigned long)(&__init_end));
 }
@@ -566,7 +558,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
 	 *   - relocate_initrd()
 	 * So here We can do PAGE_ALIGN() safely to get partial page to be freed
 	 */
-	free_init_pages("initrd memory", start, PAGE_ALIGN(end));
+	free_init_pages("initrd", start, PAGE_ALIGN(end));
 }
 #endif
 
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index bb00c46..32e2f25 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1166,11 +1166,10 @@ void mark_rodata_ro(void)
 	set_memory_ro(start, (end-start) >> PAGE_SHIFT);
 #endif
 
-	free_init_pages("unused kernel memory",
+	free_init_pages("unused kernel",
 			(unsigned long) __va(__pa_symbol(text_end)),
 			(unsigned long) __va(__pa_symbol(rodata_start)));
-
-	free_init_pages("unused kernel memory",
+	free_init_pages("unused kernel",
 			(unsigned long) __va(__pa_symbol(rodata_end)),
 			(unsigned long) __va(__pa_symbol(_sdata)));
 }
-- 
1.8.1.2

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[PATCH v6, part3 05/16] mm/tile: use common help functions to free reserved pages

[Jiang Liu]

Use common help functions to free reserved pages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: linux-kernel@vger.kernel.org
---
 arch/tile/mm/init.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index 2749515..ccfeb3f 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -720,7 +720,7 @@ static void __init init_free_pfn_range(unsigned long start, unsigned long end)
 		}
 		init_page_count(page);
 		__free_pages(page, order);
-		totalram_pages += count;
+		adjust_managed_page_count(page, count);
 
 		page += count;
 		pfn += count;
@@ -1024,16 +1024,13 @@ static void free_init_pages(char *what, unsigned long begin, unsigned long end)
 			pte_clear(&init_mm, addr, ptep);
 			continue;
 		}
-		__ClearPageReserved(page);
-		init_page_count(page);
 		if (pte_huge(*ptep))
 			BUG_ON(!kdata_huge);
 		else
 			set_pte_at(&init_mm, addr, ptep,
 				   pfn_pte(pfn, PAGE_KERNEL));
 		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
-		free_page(addr);
-		totalram_pages++;
+		free_reserved_page(page);
 	}
 	pr_info("Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
 }
-- 
1.8.1.2

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[PATCH v6, part3 06/16] mm, powertv: use free_reserved_area() to simplify code

[Jiang Liu]

Use common help function free_reserved_area() to simplify code.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
---
 arch/mips/powertv/asic/asic_devices.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/arch/mips/powertv/asic/asic_devices.c b/arch/mips/powertv/asic/asic_devices.c
index d38b095..9f64c23 100644
--- a/arch/mips/powertv/asic/asic_devices.c
+++ b/arch/mips/powertv/asic/asic_devices.c
@@ -529,17 +529,8 @@ EXPORT_SYMBOL(asic_resource_get);
  */
 void platform_release_memory(void *ptr, int size)
 {
-	unsigned long addr;
-	unsigned long end;
-
-	addr = ((unsigned long)ptr + (PAGE_SIZE - 1)) & PAGE_MASK;
-	end = ((unsigned long)ptr + size) & PAGE_MASK;
-
-	for (; addr < end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(__va(addr)));
-		init_page_count(virt_to_page(__va(addr)));
-		free_page((unsigned long)__va(addr));
-	}
+	free_reserved_area((unsigned long)ptr, (unsigned long)(ptr + size),
+			   -1, NULL);
 }
 EXPORT_SYMBOL(platform_release_memory);
 
-- 
1.8.1.2

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[PATCH v6, part3 07/16] mm, acornfb: use free_reserved_area() to simplify code

[Jiang Liu]

Use common help function free_reserved_area() to simplify code.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/video/acornfb.c | 28 ++--------------------------
 1 file changed, 2 insertions(+), 26 deletions(-)

diff --git a/drivers/video/acornfb.c b/drivers/video/acornfb.c
index 6488a73..344f2bb 100644
--- a/drivers/video/acornfb.c
+++ b/drivers/video/acornfb.c
@@ -1188,32 +1188,8 @@ static int acornfb_detect_monitortype(void)
 static inline void
 free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
 {
-	int mb_freed = 0;
-
-	/*
-	 * Align addresses
-	 */
-	virtual_start = PAGE_ALIGN(virtual_start);
-	virtual_end = PAGE_ALIGN(virtual_end);
-
-	while (virtual_start < virtual_end) {
-		struct page *page;
-
-		/*
-		 * Clear page reserved bit,
-		 * set count to 1, and free
-		 * the page.
-		 */
-		page = virt_to_page(virtual_start);
-		ClearPageReserved(page);
-		init_page_count(page);
-		free_page(virtual_start);
-
-		virtual_start += PAGE_SIZE;
-		mb_freed += PAGE_SIZE / 1024;
-	}
-
-	printk("acornfb: freed %dK memory\n", mb_freed);
+	free_reserved_area(virtual_start, PAGE_ALIGN(virtual_end),
+			   -1, "acornfb");
 }
 
 static int acornfb_probe(struct platform_device *dev)
-- 
1.8.1.2

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[PATCH v6, part3 08/16] mm: fix some trivial typos in comments

[Jiang Liu]

Fix some trivial typos in comments.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/memory_hotplug.c | 2 +-
 mm/page_alloc.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a221fac..037d41d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -309,7 +309,7 @@ static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
 	/* can't move pfns which are higher than @z2 */
 	if (end_pfn > zone_end_pfn(z2))
 		goto out_fail;
-	/* the move out part mast at the left most of @z2 */
+	/* the move out part must be at the left most of @z2 */
 	if (start_pfn > z2->zone_start_pfn)
 		goto out_fail;
 	/* must included/overlap */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 13e566a..88c8642 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2865,7 +2865,7 @@ EXPORT_SYMBOL(free_pages_exact);
  * nr_free_zone_pages() counts the number of counts pages which are beyond the
  * high watermark within all zones at or below a given zone index.  For each
  * zone, the number of pages is calculated as:
- *     present_pages - high_pages
+ *     managed_pages - high_pages
  */
 static unsigned long nr_free_zone_pages(int offset)
 {
-- 
1.8.1.2

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[PATCH v6, part3 09/16] mm: use managed_pages to calculate default zonelist order

[Jiang Liu]

Use zone->managed_pages instead of zone->present_pages to calculate
default zonelist order because managed_pages means allocatable pages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/page_alloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 88c8642..f7714c8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3451,8 +3451,8 @@ static int default_zonelist_order(void)
 			z = &NODE_DATA(nid)->node_zones[zone_type];
 			if (populated_zone(z)) {
 				if (zone_type < ZONE_NORMAL)
-					low_kmem_size += z->present_pages;
-				total_size += z->present_pages;
+					low_kmem_size += z->managed_pages;
+				total_size += z->managed_pages;
 			} else if (zone_type == ZONE_NORMAL) {
 				/*
 				 * If any node has only lowmem, then node order
-- 
1.8.1.2

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[PATCH v6, part3 10/16] mm: accurately calculate zone->managed_pages for highmem zones

[Jiang Liu]

Commit "mm: introduce new field 'managed_pages' to struct zone" assumes
that all highmem pages will be freed into the buddy system by function
mem_init(). But that's not always true, some architectures may reserve
some highmem pages during boot. For example PPC may allocate highmem
pages for giagant HugeTLB pages, and several architectures have code to
check PageReserved flag to exclude highmem pages allocated during boot
when freeing highmem pages into the buddy system.

So treat highmem pages in the same way as normal pages, that is to:
1) reset zone->managed_pages to zero in mem_init().
2) recalculate managed_pages when freeing pages into the buddy system.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Tejun Heo <tj@kernel.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
 arch/metag/mm/init.c     |  6 ++++++
 arch/x86/mm/highmem_32.c |  6 ++++++
 include/linux/bootmem.h  |  1 +
 mm/bootmem.c             | 32 ++++++++++++++++++--------------
 mm/nobootmem.c           | 30 ++++++++++++++++--------------
 mm/page_alloc.c          |  1 +
 6 files changed, 48 insertions(+), 28 deletions(-)

diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
index 5e2238d..d7595f5 100644
--- a/arch/metag/mm/init.c
+++ b/arch/metag/mm/init.c
@@ -380,6 +380,12 @@ void __init mem_init(void)
 
 #ifdef CONFIG_HIGHMEM
 	unsigned long tmp;
+
+	/*
+	 * Explicitly reset zone->managed_pages because highmem pages are
+	 * freed before calling free_all_bootmem_node();
+	 */
+	reset_all_zones_managed_pages();
 	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++)
 		free_highmem_page(pfn_to_page(tmp));
 	num_physpages += totalhigh_pages;
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index 252b8f5..4500142 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -1,6 +1,7 @@
 #include <linux/highmem.h>
 #include <linux/module.h>
 #include <linux/swap.h> /* for totalram_pages */
+#include <linux/bootmem.h>
 
 void *kmap(struct page *page)
 {
@@ -121,6 +122,11 @@ void __init set_highmem_pages_init(void)
 	struct zone *zone;
 	int nid;
 
+	/*
+	 * Explicitly reset zone->managed_pages because set_highmem_pages_init()
+	 * is invoked before free_all_bootmem()
+	 */
+	reset_all_zones_managed_pages();
 	for_each_zone(zone) {
 		unsigned long zone_start_pfn, zone_end_pfn;
 
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 5f0b0e1..0e48c32 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -46,6 +46,7 @@ extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
 
 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
 extern unsigned long free_all_bootmem(void);
+extern void reset_all_zones_managed_pages(void);
 
 extern void free_bootmem_node(pg_data_t *pgdat,
 			      unsigned long addr,
diff --git a/mm/bootmem.c b/mm/bootmem.c
index d937107..39e6156 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -242,20 +242,26 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 	return count;
 }
 
-static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
+static int reset_managed_pages_done __initdata;
+
+static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
 {
 	struct zone *z;
 
-	/*
-	 * In free_area_init_core(), highmem zone's managed_pages is set to
-	 * present_pages, and bootmem allocator doesn't allocate from highmem
-	 * zones. So there's no need to recalculate managed_pages because all
-	 * highmem pages will be managed by the buddy system. Here highmem
-	 * zone also includes highmem movable zone.
-	 */
+	if (reset_managed_pages_done)
+		return;
+
 	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
-		if (!is_highmem(z))
-			z->managed_pages = 0;
+		z->managed_pages = 0;
+}
+
+void __init reset_all_zones_managed_pages(void)
+{
+	struct pglist_data *pgdat;
+
+	for_each_online_pgdat(pgdat)
+		reset_node_managed_pages(pgdat);
+	reset_managed_pages_done = 1;
 }
 
 /**
@@ -267,7 +273,7 @@ static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 {
 	register_page_bootmem_info_node(pgdat);
-	reset_node_lowmem_managed_pages(pgdat);
+	reset_node_managed_pages(pgdat);
 	return free_all_bootmem_core(pgdat->bdata);
 }
 
@@ -280,10 +286,8 @@ unsigned long __init free_all_bootmem(void)
 {
 	unsigned long total_pages = 0;
 	bootmem_data_t *bdata;
-	struct pglist_data *pgdat;
 
-	for_each_online_pgdat(pgdat)
-		reset_node_lowmem_managed_pages(pgdat);
+	reset_all_zones_managed_pages();
 
 	list_for_each_entry(bdata, &bdata_list, list)
 		total_pages += free_all_bootmem_core(bdata);
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index bdd3fa2..0ae8d91 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -137,20 +137,25 @@ static unsigned long __init free_low_memory_core_early(void)
 	return count;
 }
 
-static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
+static int reset_managed_pages_done __initdata;
+
+static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
 {
 	struct zone *z;
 
-	/*
-	 * In free_area_init_core(), highmem zone's managed_pages is set to
-	 * present_pages, and bootmem allocator doesn't allocate from highmem
-	 * zones. So there's no need to recalculate managed_pages because all
-	 * highmem pages will be managed by the buddy system. Here highmem
-	 * zone also includes highmem movable zone.
-	 */
+	if (reset_managed_pages_done)
+		return;
 	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
-		if (!is_highmem(z))
-			z->managed_pages = 0;
+		z->managed_pages = 0;
+}
+
+void __init reset_all_zones_managed_pages(void)
+{
+	struct pglist_data *pgdat;
+
+	for_each_online_pgdat(pgdat)
+		reset_node_managed_pages(pgdat);
+	reset_managed_pages_done = 1;
 }
 
 /**
@@ -160,10 +165,7 @@ static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
  */
 unsigned long __init free_all_bootmem(void)
 {
-	struct pglist_data *pgdat;
-
-	for_each_online_pgdat(pgdat)
-		reset_node_lowmem_managed_pages(pgdat);
+	reset_all_zones_managed_pages();
 
 	/*
 	 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f7714c8..0e681d3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5213,6 +5213,7 @@ void free_highmem_page(struct page *page)
 {
 	__free_reserved_page(page);
 	totalram_pages++;
+	page_zone(page)->managed_pages++;
 	totalhigh_pages++;
 }
 #endif
-- 
1.8.1.2

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[PATCH v6, part3 11/16] mm: use a dedicated lock to protect totalram_pages and zone->managed_pages

[Jiang Liu]

Currently lock_memory_hotplug()/unlock_memory_hotplug() are used to
protect totalram_pages and zone->managed_pages. Other than the memory
hotplug driver, totalram_pages and zone->managed_pages may also be
modified at runtime by other drivers, such as Xen balloon,
virtio_balloon etc. For those cases, memory hotplug lock is a little
too heavy, so introduce a dedicated lock to protect totalram_pages
and zone->managed_pages.

Now we have a simplified locking rules totalram_pages and
zone->managed_pages as:
1) no locking for read accesses because they are unsigned long.
2) no locking for write accesses at boot time in single-threaded context.
3) serialize write accesses at runtime by acquiring the dedicated
   managed_page_count_lock.

Also adjust zone->managed_pages when freeing reserved pages into the
buddy system, to keep totalram_pages and zone->managed_pages in
consistence.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michel Lespinasse <walken@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org (open list:MEMORY MANAGEMENT)
Cc: linux-kernel@vger.kernel.org (open list)
---
 include/linux/mm.h     |  6 ++----
 include/linux/mmzone.h | 14 ++++++++++----
 mm/page_alloc.c        | 12 ++++++++++++
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a56bcaa..bfe3686 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1309,6 +1309,7 @@ extern void free_initmem(void);
  */
 extern unsigned long free_reserved_area(void *start, void *end,
 					int poison, char *s);
+
 #ifdef	CONFIG_HIGHMEM
 /*
  * Free a highmem page into the buddy system, adjusting totalhigh_pages
@@ -1317,10 +1318,7 @@ extern unsigned long free_reserved_area(void *start, void *end,
 extern void free_highmem_page(struct page *page);
 #endif
 
-static inline void adjust_managed_page_count(struct page *page, long count)
-{
-	totalram_pages += count;
-}
+extern void adjust_managed_page_count(struct page *page, long count);
 
 /* Free the reserved page into the buddy system, so it gets managed. */
 static inline void __free_reserved_page(struct page *page)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8c9f859..14ca1a9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -474,10 +474,16 @@ struct zone {
 	 * frequently read in proximity to zone->lock.  It's good to
 	 * give them a chance of being in the same cacheline.
 	 *
-	 * Write access to present_pages and managed_pages at runtime should
-	 * be protected by lock_memory_hotplug()/unlock_memory_hotplug().
-	 * Any reader who can't tolerant drift of present_pages and
-	 * managed_pages should hold memory hotplug lock to get a stable value.
+	 * Write access to present_pages at runtime should be protected by
+	 * lock_memory_hotplug()/unlock_memory_hotplug().  Any reader who can't
+	 * tolerant drift of present_pages should hold memory hotplug lock to
+	 * get a stable value.
+	 *
+	 * Read access to managed_pages should be safe because it's unsigned
+	 * long. Write access to zone->managed_pages and totalram_pages are
+	 * protected by managed_page_count_lock at runtime. Idealy only
+	 * adjust_managed_page_count() should be used instead of directly
+	 * touching zone->managed_pages and totalram_pages.
 	 */
 	unsigned long		spanned_pages;
 	unsigned long		present_pages;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0e681d3..14117a2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -100,6 +100,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
 };
 EXPORT_SYMBOL(node_states);
 
+/* Protect totalram_pages and zone->managed_pages */
+static DEFINE_SPINLOCK(managed_page_count_lock);
+
 unsigned long totalram_pages __read_mostly;
 unsigned long totalreserve_pages __read_mostly;
 /*
@@ -5188,6 +5191,15 @@ early_param("movablecore", cmdline_parse_movablecore);
 
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
+void adjust_managed_page_count(struct page *page, long count)
+{
+	spin_lock(&managed_page_count_lock);
+	page_zone(page)->managed_pages += count;
+	totalram_pages += count;
+	spin_unlock(&managed_page_count_lock);
+}
+EXPORT_SYMBOL(adjust_managed_page_count);
+
 unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
 {
 	void *pos;
-- 
1.8.1.2

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[PATCH v6, part3 12/16] mm: make __free_pages_bootmem() only available at boot time

[Jiang Liu]

In order to simpilify management of totalram_pages and
zone->managed_pages, make __free_pages_bootmem() only available
at boot time. With this change applied, __free_pages_bootmem()
will only be used by bootmem.c and nobootmem.c at boot time,
so mark it as __init.  Other callers of __free_pages_bootmem()
have been converted to use free_reserved_page(), which handles
totalram_pages and zone->managed_pages in a safer way.

This patch also fix a bug in free_pagetable() for x86_64, which
should increase zone->managed_pages instead of zone->present_pages
when freeing reserved pages.

And now we have managed_pages_count_lock to protect totalram_pages
and zone->managed_pages, so remove the redundant ppb_lock lock in
put_page_bootmem(). This greatly simplifies the locking rules.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
 arch/x86/mm/init_64.c | 18 ++----------------
 mm/memory_hotplug.c   | 16 ++--------------
 mm/page_alloc.c       |  9 +--------
 3 files changed, 5 insertions(+), 38 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 32e2f25..3bdf32b 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -712,36 +712,22 @@ EXPORT_SYMBOL_GPL(arch_add_memory);
 
 static void __meminit free_pagetable(struct page *page, int order)
 {
-	struct zone *zone;
-	bool bootmem = false;
 	unsigned long magic;
 	unsigned int nr_pages = 1 << order;
 
 	/* bootmem page has reserved flag */
 	if (PageReserved(page)) {
 		__ClearPageReserved(page);
-		bootmem = true;
 
 		magic = (unsigned long)page->lru.next;
 		if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 			while (nr_pages--)
 				put_page_bootmem(page++);
 		} else
-			__free_pages_bootmem(page, order);
+			while (nr_pages--)
+				free_reserved_page(page++);
 	} else
 		free_pages((unsigned long)page_address(page), order);
-
-	/*
-	 * SECTION_INFO pages and MIX_SECTION_INFO pages
-	 * are all allocated by bootmem.
-	 */
-	if (bootmem) {
-		zone = page_zone(page);
-		zone_span_writelock(zone);
-		zone->present_pages += nr_pages;
-		zone_span_writeunlock(zone);
-		totalram_pages += nr_pages;
-	}
 }
 
 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 037d41d..c291295 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -101,12 +101,9 @@ void get_page_bootmem(unsigned long info,  struct page *page,
 	atomic_inc(&page->_count);
 }
 
-/* reference to __meminit __free_pages_bootmem is valid
- * so use __ref to tell modpost not to generate a warning */
-void __ref put_page_bootmem(struct page *page)
+void put_page_bootmem(struct page *page)
 {
 	unsigned long type;
-	static DEFINE_MUTEX(ppb_lock);
 
 	type = (unsigned long) page->lru.next;
 	BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
@@ -116,17 +113,8 @@ void __ref put_page_bootmem(struct page *page)
 		ClearPagePrivate(page);
 		set_page_private(page, 0);
 		INIT_LIST_HEAD(&page->lru);
-
-		/*
-		 * Please refer to comment for __free_pages_bootmem()
-		 * for why we serialize here.
-		 */
-		mutex_lock(&ppb_lock);
-		__free_pages_bootmem(page, 0);
-		mutex_unlock(&ppb_lock);
-		totalram_pages++;
+		free_reserved_page(page);
 	}
-
 }
 
 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 14117a2..a07e70a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -745,14 +745,7 @@ static void __free_pages_ok(struct page *page, unsigned int order)
 	local_irq_restore(flags);
 }
 
-/*
- * Read access to zone->managed_pages is safe because it's unsigned long,
- * but we still need to serialize writers. Currently all callers of
- * __free_pages_bootmem() except put_page_bootmem() should only be used
- * at boot time. So for shorter boot time, we shift the burden to
- * put_page_bootmem() to serialize writers.
- */
-void __meminit __free_pages_bootmem(struct page *page, unsigned int order)
+void __init __free_pages_bootmem(struct page *page, unsigned int order)
 {
 	unsigned int nr_pages = 1 << order;
 	unsigned int loop;
-- 
1.8.1.2

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[PATCH v6, part3 13/16] mm: correctly update zone->mamaged_pages

[Jiang Liu]

Enhance adjust_managed_page_count() to adjust totalhigh_pages for
highmem pages. And change code which directly adjusts totalram_pages
to use adjust_managed_page_count() because it adjusts totalram_pages,
totalhigh_pages and zone->managed_pages altogether in a safe way.

Remove inc_totalhigh_pages() and dec_totalhigh_pages() from xen/balloon
driver bacause adjust_managed_page_count() has already adjusted
totalhigh_pages.

This patch also fixes two bugs:
1) enhances virtio_balloon driver to adjust totalhigh_pages when
   reserve/unreserve pages.
2) enhance memory_hotplug.c to adjust totalhigh_pages when hot-removing
   memory.

We still need to deal with modifications of totalram_pages in file
arch/powerpc/platforms/pseries/cmm.c, but need help from PPC experts.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xensource.com
Cc: linux-mm@kvack.org
---
 drivers/virtio/virtio_balloon.c |  8 +++++---
 drivers/xen/balloon.c           | 23 +++++------------------
 mm/hugetlb.c                    |  2 +-
 mm/memory_hotplug.c             | 15 +++------------
 mm/page_alloc.c                 | 10 +++++-----
 5 files changed, 19 insertions(+), 39 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index bd3ae32..6649968 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -148,7 +148,7 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
 		}
 		set_page_pfns(vb->pfns + vb->num_pfns, page);
 		vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE;
-		totalram_pages--;
+		adjust_managed_page_count(page, -1);
 	}
 
 	/* Did we get any? */
@@ -160,11 +160,13 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
 static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
 {
 	unsigned int i;
+	struct page *page;
 
 	/* Find pfns pointing at start of each page, get pages and free them. */
 	for (i = 0; i < num; i += VIRTIO_BALLOON_PAGES_PER_PAGE) {
-		balloon_page_free(balloon_pfn_to_page(pfns[i]));
-		totalram_pages++;
+		page = balloon_pfn_to_page(pfns[i]);
+		balloon_page_free(page);
+		adjust_managed_page_count(page, 1);
 	}
 }
 
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d42da3b..a453c05 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats);
 /* We increase/decrease in batches which fit in a page */
 static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)];
 
-#ifdef CONFIG_HIGHMEM
-#define inc_totalhigh_pages() (totalhigh_pages++)
-#define dec_totalhigh_pages() (totalhigh_pages--)
-#else
-#define inc_totalhigh_pages() do {} while (0)
-#define dec_totalhigh_pages() do {} while (0)
-#endif
-
 /* List of ballooned pages, threaded through the mem_map array. */
 static LIST_HEAD(ballooned_pages);
 
@@ -132,9 +124,7 @@ static void __balloon_append(struct page *page)
 static void balloon_append(struct page *page)
 {
 	__balloon_append(page);
-	if (PageHighMem(page))
-		dec_totalhigh_pages();
-	totalram_pages--;
+	adjust_managed_page_count(page, -1);
 }
 
 /* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
@@ -151,13 +141,12 @@ static struct page *balloon_retrieve(bool prefer_highmem)
 		page = list_entry(ballooned_pages.next, struct page, lru);
 	list_del(&page->lru);
 
-	if (PageHighMem(page)) {
+	if (PageHighMem(page))
 		balloon_stats.balloon_high--;
-		inc_totalhigh_pages();
-	} else
+	else
 		balloon_stats.balloon_low--;
 
-	totalram_pages++;
+	adjust_managed_page_count(page, 1);
 
 	return page;
 }
@@ -374,9 +363,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
 #endif
 
 		/* Relinquish the page back to the allocator. */
-		ClearPageReserved(page);
-		init_page_count(page);
-		__free_page(page);
+		__free_reserved_page(page);
 	}
 
 	balloon_stats.current_pages += rc;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f8feeec..95c5a6b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1246,7 +1246,7 @@ static void __init gather_bootmem_prealloc(void)
 		 * side-effects, like CommitLimit going negative.
 		 */
 		if (h->order > (MAX_ORDER - 1))
-			totalram_pages += 1 << h->order;
+			adjust_managed_page_count(page, 1 << h->order);
 	}
 }
 
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c291295..304ada7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -769,20 +769,13 @@ EXPORT_SYMBOL_GPL(__online_page_set_limits);
 
 void __online_page_increment_counters(struct page *page)
 {
-	totalram_pages++;
-
-#ifdef CONFIG_HIGHMEM
-	if (PageHighMem(page))
-		totalhigh_pages++;
-#endif
+	adjust_managed_page_count(page, 1);
 }
 EXPORT_SYMBOL_GPL(__online_page_increment_counters);
 
 void __online_page_free(struct page *page)
 {
-	ClearPageReserved(page);
-	init_page_count(page);
-	__free_page(page);
+	__free_reserved_page(page);
 }
 EXPORT_SYMBOL_GPL(__online_page_free);
 
@@ -979,7 +972,6 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 		return ret;
 	}
 
-	zone->managed_pages += onlined_pages;
 	zone->present_pages += onlined_pages;
 	zone->zone_pgdat->node_present_pages += onlined_pages;
 	if (onlined_pages) {
@@ -1563,10 +1555,9 @@ repeat:
 	/* reset pagetype flags and makes migrate type to be MOVABLE */
 	undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
 	/* removal success */
-	zone->managed_pages -= offlined_pages;
+	adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages);
 	zone->present_pages -= offlined_pages;
 	zone->zone_pgdat->node_present_pages -= offlined_pages;
-	totalram_pages -= offlined_pages;
 
 	init_per_zone_wmark_min();
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a07e70a..56b0097 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -780,11 +780,7 @@ void __init init_cma_reserved_pageblock(struct page *page)
 	set_page_refcounted(page);
 	set_pageblock_migratetype(page, MIGRATE_CMA);
 	__free_pages(page, pageblock_order);
-	totalram_pages += pageblock_nr_pages;
-#ifdef CONFIG_HIGHMEM
-	if (PageHighMem(page))
-		totalhigh_pages += pageblock_nr_pages;
-#endif
+	adjust_managed_page_count(page, pageblock_nr_pages);
 }
 #endif
 
@@ -5189,6 +5185,10 @@ void adjust_managed_page_count(struct page *page, long count)
 	spin_lock(&managed_page_count_lock);
 	page_zone(page)->managed_pages += count;
 	totalram_pages += count;
+#ifdef	CONFIG_HIGHMEM
+	if (PageHighMem(page))
+		totalhigh_pages += count;
+#endif
 	spin_unlock(&managed_page_count_lock);
 }
 EXPORT_SYMBOL(adjust_managed_page_count);
-- 
1.8.1.2

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[PATCH v6, part3 14/16] mm: concentrate modification of totalram_pages into the mm core

[Jiang Liu]

Concentrate code to modify totalram_pages into the mm core, so the arch
memory initialized code doesn't need to take care of it. With these
changes applied, only following functions from mm core modify global
variable totalram_pages:
free_bootmem_late(), free_all_bootmem(), free_all_bootmem_node(),
adjust_managed_page_count().

With this patch applied, it will be much more easier for us to keep
totalram_pages and zone->managed_pages in consistence.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 arch/alpha/mm/init.c             | 2 +-
 arch/alpha/mm/numa.c             | 2 +-
 arch/arc/mm/init.c               | 2 +-
 arch/arm/mm/init.c               | 3 +--
 arch/arm64/mm/init.c             | 2 +-
 arch/avr32/mm/init.c             | 2 --
 arch/blackfin/mm/init.c          | 2 +-
 arch/c6x/mm/init.c               | 2 +-
 arch/cris/mm/init.c              | 2 +-
 arch/frv/mm/init.c               | 2 +-
 arch/h8300/mm/init.c             | 2 +-
 arch/hexagon/mm/init.c           | 2 +-
 arch/ia64/mm/init.c              | 2 +-
 arch/m32r/mm/init.c              | 2 +-
 arch/m68k/mm/init.c              | 4 ++--
 arch/metag/mm/init.c             | 5 +----
 arch/microblaze/mm/init.c        | 2 +-
 arch/mips/mm/init.c              | 2 +-
 arch/mips/sgi-ip27/ip27-memory.c | 2 +-
 arch/mn10300/mm/init.c           | 2 +-
 arch/openrisc/mm/init.c          | 2 +-
 arch/parisc/mm/init.c            | 4 ++--
 arch/powerpc/mm/mem.c            | 5 ++---
 arch/s390/mm/init.c              | 2 +-
 arch/score/mm/init.c             | 2 +-
 arch/sh/mm/init.c                | 2 +-
 arch/sparc/mm/init_32.c          | 3 +--
 arch/sparc/mm/init_64.c          | 2 +-
 arch/tile/mm/init.c              | 2 +-
 arch/um/kernel/mem.c             | 2 +-
 arch/unicore32/mm/init.c         | 2 +-
 arch/x86/mm/init_32.c            | 2 +-
 arch/x86/mm/init_64.c            | 2 +-
 arch/xtensa/mm/init.c            | 2 +-
 mm/bootmem.c                     | 9 ++++++++-
 mm/nobootmem.c                   | 7 ++++++-
 36 files changed, 50 insertions(+), 46 deletions(-)

diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index 218c29c..eee47a4 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -309,7 +309,7 @@ void __init
 mem_init(void)
 {
 	max_mapnr = num_physpages = max_low_pfn;
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 
 	printk_memory_info();
diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
index 3388504..857452c 100644
--- a/arch/alpha/mm/numa.c
+++ b/arch/alpha/mm/numa.c
@@ -334,7 +334,7 @@ void __init mem_init(void)
 		/*
 		 * This will free up the bootmem, ie, slot 0 memory
 		 */
-		totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
+		free_all_bootmem_node(NODE_DATA(nid));
 
 		pfn = NODE_DATA(nid)->node_start_pfn;
 		for (i = 0; i < node_spanned_pages(nid); i++, pfn++)
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index f9c7077..c668a60 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -111,7 +111,7 @@ void __init mem_init(void)
 
 	high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
 
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	/* count all reserved pages [kernel code/data/mem_map..] */
 	reserved_pages = 0;
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index f223394..4ca7c1a 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -595,8 +595,7 @@ void __init mem_init(void)
 
 	/* this will put all unused low memory onto the freelists */
 	free_unused_memmap(&meminfo);
-
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 #ifdef CONFIG_SA1111
 	/* now that our DMA memory is actually so designated, we can free it */
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index a398eb9..93de98a 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -284,7 +284,7 @@ void __init mem_init(void)
 	free_unused_memmap();
 #endif
 
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	reserved_pages = free_pages = 0;
 
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index b079e04..af6890f 100644
--- a/arch/avr32/mm/init.c
+++ b/arch/avr32/mm/init.c
@@ -117,8 +117,6 @@ void __init mem_init(void)
 		if (pgdat->node_spanned_pages != 0)
 			node_pages = free_all_bootmem_node(pgdat);
 
-		totalram_pages += node_pages;
-
 		for (i = 0; i < node_pages; i++)
 			if (PageReserved(pgdat->node_mem_map + i))
 				reservedpages++;
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index fa241f5..c73d80e 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -104,7 +104,7 @@ void __init mem_init(void)
 	printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
 
 	/* This will put all low memory onto the freelists. */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	reservedpages = 0;
 	for (tmp = ARCH_PFN_OFFSET; tmp < max_mapnr; tmp++)
diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c
index 7f25bef..df3714b 100644
--- a/arch/c6x/mm/init.c
+++ b/arch/c6x/mm/init.c
@@ -64,7 +64,7 @@ void __init mem_init(void)
 	high_memory = (void *)(memory_end & PAGE_MASK);
 
 	/* this will put all memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	codek = (_etext - _stext) >> 10;
 	datak = (_end - _sdata) >> 10;
diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c
index 8fec263..52b8b56 100644
--- a/arch/cris/mm/init.c
+++ b/arch/cris/mm/init.c
@@ -33,7 +33,7 @@ mem_init(void)
 	max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
  
 	/* this will put all memory onto the freelists */
-        totalram_pages = free_all_bootmem();
+        free_all_bootmem();
 
 	reservedpages = 0;
 	for (tmp = 0; tmp < max_mapnr; tmp++) {
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
index 8ba9d22..3dcc888 100644
--- a/arch/frv/mm/init.c
+++ b/arch/frv/mm/init.c
@@ -123,7 +123,7 @@ void __init mem_init(void)
 	int codek = 0, datak = 0;
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 #ifdef CONFIG_MMU
 	for (loop = 0 ; loop < npages ; loop++)
diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c
index c831f1d..a506dd4 100644
--- a/arch/h8300/mm/init.c
+++ b/arch/h8300/mm/init.c
@@ -140,7 +140,7 @@ void __init mem_init(void)
 	max_mapnr = num_physpages = MAP_NR(high_memory);
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	codek = (_etext - _stext) >> 10;
 	datak = (__bss_stop - _sdata) >> 10;
diff --git a/arch/hexagon/mm/init.c b/arch/hexagon/mm/init.c
index 2561d25..0ab5b43 100644
--- a/arch/hexagon/mm/init.c
+++ b/arch/hexagon/mm/init.c
@@ -70,7 +70,7 @@ unsigned long long kmap_generation;
 void __init mem_init(void)
 {
 	/*  No idea where this is actually declared.  Seems to evade LXR.  */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 	num_physpages = bootmem_lastpg-ARCH_PFN_OFFSET;
 
 	printk(KERN_INFO "totalram_pages = %ld\n", totalram_pages);
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index f8a4f38..d141f7e 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -622,7 +622,7 @@ mem_init (void)
 
 	for_each_online_pgdat(pgdat)
 		if (pgdat->bdata->node_bootmem_map)
-			totalram_pages += free_all_bootmem_node(pgdat);
+			free_all_bootmem_node(pgdat);
 
 	reserved_pages = 0;
 	efi_memmap_walk(count_reserved_pages, &reserved_pages);
diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c
index cca87d9..a501838 100644
--- a/arch/m32r/mm/init.c
+++ b/arch/m32r/mm/init.c
@@ -158,7 +158,7 @@ void __init mem_init(void)
 
 	/* this will put all low memory onto the freelists */
 	for_each_online_node(nid)
-		totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
+		free_all_bootmem_node(NODE_DATA(nid));
 
 	reservedpages = reservedpages_count() - hole_pages;
 	codesize = (unsigned long) &_etext - (unsigned long)&_text;
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index ab0b54c..614c60a 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -155,11 +155,11 @@ void __init mem_init(void)
 	int i;
 
 	/* this will put all memory onto the freelists */
-	totalram_pages = num_physpages = 0;
+	num_physpages = 0;
 	for_each_online_pgdat(pgdat) {
 		num_physpages += pgdat->node_present_pages;
 
-		totalram_pages += free_all_bootmem_node(pgdat);
+		free_all_bootmem_node(pgdat);
 		for (i = 0; i < pgdat->node_spanned_pages; i++) {
 			struct page *page = pgdat->node_mem_map + i;
 			char *addr = page_to_virt(page);
diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
index d7595f5..ce81d7c 100644
--- a/arch/metag/mm/init.c
+++ b/arch/metag/mm/init.c
@@ -393,14 +393,11 @@ void __init mem_init(void)
 
 	for_each_online_node(nid) {
 		pg_data_t *pgdat = NODE_DATA(nid);
-		unsigned long node_pages = 0;
 
 		num_physpages += pgdat->node_present_pages;
 
 		if (pgdat->node_spanned_pages)
-			node_pages = free_all_bootmem_node(pgdat);
-
-		totalram_pages += node_pages;
+			free_all_bootmem_node(pgdat);
 	}
 
 	pr_info("Memory: %luk/%luk available\n",
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index d149e0e..b384cbc 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -252,7 +252,7 @@ void __init mem_init(void)
 	high_memory = (void *)__va(memory_start + lowmem_size - 1);
 
 	/* this will put all memory onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	for_each_online_pgdat(pgdat) {
 		unsigned long i;
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 268f2a9..e7333f1 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -374,7 +374,7 @@ void __init mem_init(void)
 #endif
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 	setup_zero_pages();	/* Setup zeroed pages.  */
 
 	reservedpages = ram = 0;
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index 1230f56..aecac4a 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -489,7 +489,7 @@ void __init mem_init(void)
 		/*
 		 * This will free up the bootmem, ie, slot 0 memory.
 		 */
-		totalram_pages += free_all_bootmem_node(NODE_DATA(node));
+		free_all_bootmem_node(NODE_DATA(node));
 	}
 
 	setup_zero_pages();	/* This comes from node 0 */
diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
index e19049d..7590d91 100644
--- a/arch/mn10300/mm/init.c
+++ b/arch/mn10300/mm/init.c
@@ -114,7 +114,7 @@ void __init mem_init(void)
 	memset(empty_zero_page, 0, PAGE_SIZE);
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	reservedpages = 0;
 	for (tmp = 0; tmp < num_physpages; tmp++)
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index c371e4a..16c1e13 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -207,7 +207,7 @@ static int __init free_pages_init(void)
 	int reservedpages, pfn;
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	reservedpages = 0;
 	for (pfn = 0; pfn < max_low_pfn; pfn++) {
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index aaa1fbc..c3a3f42 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -593,13 +593,13 @@ void __init mem_init(void)
 
 #ifndef CONFIG_DISCONTIGMEM
 	max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 #else
 	{
 		int i;
 
 		for (i = 0; i < npmem_ranges; i++)
-			totalram_pages += free_all_bootmem_node(NODE_DATA(i));
+			free_all_bootmem_node(NODE_DATA(i));
 	}
 #endif
 
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 7f47a05..3bcfc0d 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -318,13 +318,12 @@ void __init mem_init(void)
         for_each_online_node(nid) {
 		if (NODE_DATA(nid)->node_spanned_pages != 0) {
 			printk("freeing bootmem node %d\n", nid);
-			totalram_pages +=
-				free_all_bootmem_node(NODE_DATA(nid));
+			free_all_bootmem_node(NODE_DATA(nid));
 		}
 	}
 #else
 	max_mapnr = max_pfn;
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 #endif
 	for_each_online_pgdat(pgdat) {
 		for (i = 0; i < pgdat->node_spanned_pages; i++) {
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index bf01d18..a2aafe1 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -144,7 +144,7 @@ void __init mem_init(void)
 	cmma_init();
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 	setup_zero_pages();	/* Setup zeroed pages. */
 
 	reservedpages = 0;
diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c
index 3d79ecb..c1601da 100644
--- a/arch/score/mm/init.c
+++ b/arch/score/mm/init.c
@@ -81,7 +81,7 @@ void __init mem_init(void)
 	unsigned long tmp, ram = 0;
 
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 	setup_zero_page();	/* Setup zeroed pages. */
 	reservedpages = 0;
 
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index d3af56b..fc0c8e1 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -422,7 +422,7 @@ void __init mem_init(void)
 		num_physpages += pgdat->node_present_pages;
 
 		if (pgdat->node_spanned_pages)
-			totalram_pages += free_all_bootmem_node(pgdat);
+			free_all_bootmem_node(pgdat);
 
 
 		node_high_memory = (void *)__va((pgdat->node_start_pfn +
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index d5f9c02..a438abb 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -323,8 +323,7 @@ void __init mem_init(void)
 
 	max_mapnr = last_valid_pfn - pfn_base;
 	high_memory = __va(max_low_pfn << PAGE_SHIFT);
-
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 		unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index a54cdcd..ee6deda 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2054,7 +2054,7 @@ void __init mem_init(void)
 	high_memory = __va(last_valid_pfn << PAGE_SHIFT);
 
 	register_page_bootmem_info();
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	/* We subtract one to account for the mem_map_zero page
 	 * allocated below.
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index ccfeb3f..45ce26d 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -846,7 +846,7 @@ void __init mem_init(void)
 	set_max_mapnr_init();
 
 	/* this will put all bootmem onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 #ifndef CONFIG_64BIT
 	/* count all remaining LOWMEM and give all HIGHMEM to page allocator */
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 8ff0b7a..b0c7630 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -65,7 +65,7 @@ void __init mem_init(void)
 	uml_reserved = brk_end;
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 	max_low_pfn = totalram_pages;
 #ifdef CONFIG_HIGHMEM
 	setup_highmem(end_iomem, highmem);
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index df9b8ab..7d1356c 100644
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -392,7 +392,7 @@ void __init mem_init(void)
 	free_unused_memmap(&meminfo);
 
 	/* this will put all unused low memory onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	reserved_pages = free_pages = 0;
 
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 3ac7e31..9fa46ba 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -759,7 +759,7 @@ void __init mem_init(void)
 	set_highmem_pages_init();
 
 	/* this will put all low memory onto the freelists */
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	reservedpages = 0;
 	for (tmp = 0; tmp < max_low_pfn; tmp++)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 3bdf32b..7d27958 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1054,7 +1054,7 @@ void __init mem_init(void)
 	register_page_bootmem_info();
 
 	/* this will put all memory onto the freelists */
-	totalram_pages = free_all_bootmem();
+	free_all_bootmem();
 
 	absent_pages = absent_pages_in_range(0, max_pfn);
 	reservedpages = max_pfn - totalram_pages - absent_pages;
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 026d29b..663c161 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -184,7 +184,7 @@ void __init mem_init(void)
 #error HIGHGMEM not implemented in init.c
 #endif
 
-	totalram_pages += free_all_bootmem();
+	free_all_bootmem();
 
 	reservedpages = ram = 0;
 	for (tmp = 0; tmp < max_mapnr; tmp++) {
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 39e6156..a19404b 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -272,9 +272,14 @@ void __init reset_all_zones_managed_pages(void)
  */
 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 {
+	unsigned long pages;
+
 	register_page_bootmem_info_node(pgdat);
 	reset_node_managed_pages(pgdat);
-	return free_all_bootmem_core(pgdat->bdata);
+	pages = free_all_bootmem_core(pgdat->bdata);
+	totalram_pages += pages;
+
+	return pages;
 }
 
 /**
@@ -292,6 +297,8 @@ unsigned long __init free_all_bootmem(void)
 	list_for_each_entry(bdata, &bdata_list, list)
 		total_pages += free_all_bootmem_core(bdata);
 
+	totalram_pages += total_pages;
+
 	return total_pages;
 }
 
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 0ae8d91..61107cf 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -165,6 +165,8 @@ void __init reset_all_zones_managed_pages(void)
  */
 unsigned long __init free_all_bootmem(void)
 {
+	unsigned long pages;
+
 	reset_all_zones_managed_pages();
 
 	/*
@@ -172,7 +174,10 @@ unsigned long __init free_all_bootmem(void)
 	 *  because in some case like Node0 doesn't have RAM installed
 	 *  low ram will be on Node1
 	 */
-	return free_low_memory_core_early();
+	pages = free_low_memory_core_early();
+	totalram_pages += pages;
+
+	return pages;
 }
 
 /**
-- 
1.8.1.2

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[PATCH v6, part3 15/16] mm: report available pages as "MemTotal" for each NUMA node

[Jiang Liu]

As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501,
"MemTotal" from /proc/meminfo means memory pages managed by the buddy
system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo
means phsical pages present (present_pages) within the NUMA node.
There's a difference between managed_pages and present_pages due to
bootmem allocator and reserved pages.

And Documentation/filesystems/proc.txt says
    MemTotal: Total usable ram (i.e. physical ram minus a few reserved
              bits and the kernel binary code)

So change /sys/.../node/nodex/meminfo to report available pages within
the node as "MemTotal".

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Reported-by: sworddragon2@aol.com
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/page_alloc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 56b0097..e7a517d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2924,9 +2924,13 @@ EXPORT_SYMBOL(si_meminfo);
 #ifdef CONFIG_NUMA
 void si_meminfo_node(struct sysinfo *val, int nid)
 {
+	int zone_type;		/* needs to be signed */
+	unsigned long managed_pages = 0;
 	pg_data_t *pgdat = NODE_DATA(nid);
 
-	val->totalram = pgdat->node_present_pages;
+	for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
+		managed_pages += pgdat->node_zones[zone_type].managed_pages;
+	val->totalram = managed_pages;
 	val->freeram = node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
 	val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
-- 
1.8.1.2

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Re: [PATCH v6, part3 15/16] mm: report available pages as "MemTotal" for each NUMA node

[Sergei Shtylyov]

Hello.

On 05/11/2013 09:34 PM, Jiang Liu wrote:

    I've noticed a small typo in the changelog.

> As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501,
> "MemTotal" from /proc/meminfo means memory pages managed by the buddy
> system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo
> means phsical pages present (present_pages) within the NUMA node.

     s/phsical/physical/

> There's a difference between managed_pages and present_pages due to
> bootmem allocator and reserved pages.
>
> And Documentation/filesystems/proc.txt says
>      MemTotal: Total usable ram (i.e. physical ram minus a few reserved
>                bits and the kernel binary code)
>
> So change /sys/.../node/nodex/meminfo to report available pages within
> the node as "MemTotal".
>
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
> Reported-by: sworddragon2@aol.com
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.kernel.org

WBR, Sergei

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Re: [PATCH v6, part3 15/16] mm: report available pages as "MemTotal" for each NUMA node

[Liu Jiang]

On Sun 12 May 2013 04:05:51 AM CST, Sergei Shtylyov wrote:
> Hello.
>
> On 05/11/2013 09:34 PM, Jiang Liu wrote:
>
>    I've noticed a small typo in the changelog.
>
>> As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501,
>> "MemTotal" from /proc/meminfo means memory pages managed by the buddy
>> system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo
>> means phsical pages present (present_pages) within the NUMA node.
>
>     s/phsical/physical/
Thanks Sergei, will fix it in next version.
Gerry

>
>> There's a difference between managed_pages and present_pages due to
>> bootmem allocator and reserved pages.
>>
>> And Documentation/filesystems/proc.txt says
>>      MemTotal: Total usable ram (i.e. physical ram minus a few reserved
>>                bits and the kernel binary code)
>>
>> So change /sys/.../node/nodex/meminfo to report available pages within
>> the node as "MemTotal".
>>
>> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
>> Reported-by: sworddragon2@aol.com
>> Cc: Andrew Morton <akpm@linux-foundation.org>
>> Cc: Mel Gorman <mgorman@suse.de>
>> Cc: Minchan Kim <minchan@kernel.org>
>> Cc: linux-mm@kvack.org
>> Cc: linux-kernel@vger.kernel.org
>
> WBR, Sergei
>


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[PATCH v6, part3 16/16] AVR32: fix building warnings caused by redifinitions of HZ

[Jiang Liu]

Fix building warnings caused by redifinitions of HZ:
In file included from /ws/linux/kernel/linux.git/include/uapi/linux/param.h:4,
                 from include/linux/timex.h:63,
                 from include/linux/jiffies.h:8,
                 from include/linux/ktime.h:25,
                 from include/linux/timer.h:5,
                 from include/linux/workqueue.h:8,
                 from include/linux/srcu.h:34,
                 from include/linux/notifier.h:15,
                 from include/linux/memory_hotplug.h:6,
                 from include/linux/mmzone.h:777,
                 from include/linux/gfp.h:4,
                 from arch/avr32/mm/init.c:10:
/ws/linux/kernel/linux.git/arch/avr32/include/asm/param.h:6:1: warning: "HZ" redefined
In file included from /ws/linux/kernel/linux.git/arch/avr32/include/asm/param.h:4,
                 from /ws/linux/kernel/linux.git/include/uapi/linux/param.h:4,
                 from include/linux/timex.h:63,
                 from include/linux/jiffies.h:8,
                 from include/linux/ktime.h:25,
                 from include/linux/timer.h:5,
                 from include/linux/workqueue.h:8,
                 from include/linux/srcu.h:34,
                 from include/linux/notifier.h:15,
                 from include/linux/memory_hotplug.h:6,
                 from include/linux/mmzone.h:777,
                 from include/linux/gfp.h:4,
                 from arch/avr32/mm/init.c:10:
/ws/linux/kernel/linux.git/arch/avr32/include/uapi/asm/param.h:6:1: warning: this is the location of the previous definition

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: linux-kernel@vger.kernel.org
---
 arch/avr32/include/uapi/asm/param.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/avr32/include/uapi/asm/param.h b/arch/avr32/include/uapi/asm/param.h
index d28aa5e..abda103 100644
--- a/arch/avr32/include/uapi/asm/param.h
+++ b/arch/avr32/include/uapi/asm/param.h
@@ -2,7 +2,11 @@
 #define _UAPI__ASM_AVR32_PARAM_H
 
 
-#ifndef HZ
+#ifndef __KERNEL__
+   /*
+    * Technically, this is wrong, but some old apps still refer to it.
+    * The proper way to get the HZ value is via sysconf(_SC_CLK_TCK).
+    */
 # define HZ		100
 #endif
 
-- 
1.8.1.2

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Re: [PATCH v6, part3 14/16] mm: concentrate modification of totalram_pages into the mm core

[David Howells]

Jiang Liu <liuj97@gmail.com> wrote:

> Concentrate code to modify totalram_pages into the mm core, so the arch
> memory initialized code doesn't need to take care of it. With these
> changes applied, only following functions from mm core modify global
> variable totalram_pages:
> free_bootmem_late(), free_all_bootmem(), free_all_bootmem_node(),
> adjust_managed_page_count().
> 
> With this patch applied, it will be much more easier for us to keep
> totalram_pages and zone->managed_pages in consistence.

I like it.

Acked-by: David Howells <dhowells@redhat.com>

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Re: [PATCH v6, part3 16/16] AVR32: fix building warnings caused by redifinitions of HZ

[David Howells]

Jiang Liu <liuj97@gmail.com> wrote:

> -#ifndef HZ
> +#ifndef __KERNEL__
> +   /*
> +    * Technically, this is wrong, but some old apps still refer to it.
> +    * The proper way to get the HZ value is via sysconf(_SC_CLK_TCK).
> +    */
>  # define HZ		100
>  #endif

Better still, use asm-generic/param.h and uapi/asm-generic/param.h for AVR32
instead.

David

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Re: [PATCH v6, part3 16/16] AVR32: fix building warnings caused by redifinitions of HZ

[Liu Jiang]

On 05/13/2013 05:40 PM, David Howells wrote:
> Jiang Liu <liuj97@gmail.com> wrote:
>
>> -#ifndef HZ
>> +#ifndef __KERNEL__
>> +   /*
>> +    * Technically, this is wrong, but some old apps still refer to it.
>> +    * The proper way to get the HZ value is via sysconf(_SC_CLK_TCK).
>> +    */
>>   # define HZ		100
>>   #endif
> Better still, use asm-generic/param.h and uapi/asm-generic/param.h for AVR32
> instead.
>
> David
>
Hi David,
         Great idea! Will use generic param.h for AVR32.
Regards!
Gerry

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Re: [PATCH v6, part3 02/16] mm: enhance free_reserved_area() to support poisoning memory with zero

[David Howells]

Jiang Liu <liuj97@gmail.com> wrote:

> +	free_reserved_area((void *)start, (void *)end, -1, "initrd");

Do you mean -1 or ULONG_MAX?

David

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Re: [PATCH v6, part3 02/16] mm: enhance free_reserved_area() to support poisoning memory with zero

[David Howells]

David Howells <dhowells@redhat.com> wrote:

> Jiang Liu <liuj97@gmail.com> wrote:
> 
> > +	free_reserved_area((void *)start, (void *)end, -1, "initrd");
> 
> Do you mean -1 or ULONG_MAX?

No matter...  It's a poison value, not an address.

David

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