From: Jiang Liu <liuj97@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiang Liu <jiang.liu@huawei.com>,
David Rientjes <rientjes@google.com>,
Wen Congyang <wency@cn.fujitsu.com>, Mel Gorman <mgorman@suse.de>,
Minchan Kim <minchan@kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
David Howells <dhowells@redhat.com>,
Mark Salter <msalter@redhat.com>,
Jianguo Wu <wujianguo@huawei.com>,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH v5, part3 02/15] mm: enhance free_reserved_area() to support poisoning memory with zero
Date: Wed, 8 May 2013 23:17:01 +0800 [thread overview]
Message-ID: <1368026235-5976-3-git-send-email-jiang.liu@huawei.com> (raw)
In-Reply-To: <1368026235-5976-1-git-send-email-jiang.liu@huawei.com>
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/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 | 2 +-
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 | 11 ++++++-----
mm/page_alloc.c | 2 +-
25 files changed, 48 insertions(+), 47 deletions(-)
diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
index 1d4aabf..7c57903 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((unsigned long)__va(alpha_mv.min_mem_address),
- (unsigned long)__va(memtop), 0, NULL);
+ (unsigned long)__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 0ba85ee..9930837 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
#endif
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 7a82fcd..a2ab290 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -601,7 +601,7 @@ void __init mem_init(void)
#ifdef CONFIG_SA1111
/* now that our DMA memory is actually so designated, we can free it */
free_reserved_area((unsigned long)__va(PHYS_PFN_OFFSET),
- (unsigned long)swapper_pg_dir, 0, NULL);
+ (unsigned long)swapper_pg_dir, -1, NULL);
#endif
free_highpages();
@@ -730,12 +730,12 @@ void free_initmem(void)
poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
free_reserved_area((unsigned long)&__tcm_start,
- (unsigned long)&__tcm_end, 0, "TCM link");
+ (unsigned long)&__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
@@ -746,7 +746,7 @@ 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(start, end, -1, "initrd");
}
}
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f497ca7..e58dd7f 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
}
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index e66e840..871f98a 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
#endif
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 82d01a7..e64286b 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(start, 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 a9fcd89..ce39b48 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(start, end, 0, "initrd");
+ free_reserved_area(start, 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 dee354f..a421948 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
} /* end free_initrd_mem() */
#endif
diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c
index ff349d7..488e2a3 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(start, 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 d1fe4b4..941568a 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -156,7 +156,7 @@ free_initmem (void)
{
free_reserved_area((unsigned long)ia64_imva(__init_begin),
(unsigned long)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 ab4cbce..58ea4d6 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
#endif
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index 1af2ca3..75e1cbf 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
#endif
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index 4ec137d..53383e4 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(start, end, 0, "initrd");
+ free_reserved_area(start, 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 b3cbc67..d19950c 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(start, end, 0, "initrd");
+ free_reserved_area(start, 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 157b931..27f3f88 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);
@@ -1099,6 +1099,6 @@ 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(start, end, -1, "initrd");
}
#endif
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 6782221..4d3e37d 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(start, end, -1, NULL);
}
static int __init kvm_guest_init(void)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0988a26..632ab53 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(start, end, -1, "initrd");
}
#endif
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 0b09b23..275345e 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -164,7 +164,7 @@ 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 20f9ead..31294f1 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(start, end, 0, "initrd");
+ free_reserved_area(start, end, -1, "initrd");
}
#endif
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 9df292b..1e84189 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(start, end, -1, "initrd");
}
#endif
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index 63df12d..5614b05 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(start, end, 0, "initrd");
+ free_reserved_area(start, 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 bba125b..6f70647 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(start, end, 0, "initrd");
+ free_reserved_area(start, 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 1a7f19e..9f7006f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1298,7 +1298,7 @@ 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(unsigned long start, unsigned long end,
@@ -1338,15 +1338,16 @@ 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)
{
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((unsigned long)&__init_begin ,
+ (unsigned long)&__init_end,
poison, "unused kernel");
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce259c8..2045c23 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5194,7 +5194,7 @@ unsigned long free_reserved_area(unsigned long start, unsigned long end,
pos = start = PAGE_ALIGN(start);
end &= PAGE_MASK;
for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
- if (poison)
+ if ((unsigned int)poison <= 0xFF)
memset((void *)pos, poison, PAGE_SIZE);
free_reserved_page(virt_to_page((void *)pos));
}
--
1.7.9.5
--
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next prev parent reply other threads:[~2013-05-08 15:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-08 15:16 [PATCH v5, part3 00/15] accurately calculate memory statisitic information Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 01/15] mm: fix build warnings caused by free_reserved_area() Jiang Liu
2013-05-08 18:45 ` Russell King - ARM Linux
2013-05-09 15:42 ` [PATCH] mm: change signature of free_reserved_area() to fix building warnings Jiang Liu
2013-05-08 15:17 ` Jiang Liu [this message]
2013-05-08 15:17 ` [PATCH v5, part3 03/15] mm/ARM64: kill poison_init_mem() Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 04/15] mm/x86: use free_reserved_area() to simplify code Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 05/15] mm/tile: use common help functions to free reserved pages Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 06/15] mm, powertv: use free_reserved_area() to simplify code Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 07/15] mm, acornfb: " Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 08/15] mm: fix some trivial typos in comments Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 09/15] mm: use managed_pages to calculate default zonelist order Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 10/15] mm: accurately calculate zone->managed_pages for highmem zones Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 11/15] mm: use a dedicated lock to protect totalram_pages and zone->managed_pages Jiang Liu
[not found] ` <518A6EEC.6060102@redhat.com>
2013-05-08 15:50 ` Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 12/15] mm: make __free_pages_bootmem() only available at boot time Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 13/15] mm: correctly update zone->mamaged_pages Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 14/15] mm: concentrate modification of totalram_pages into the mm core Jiang Liu
2013-05-08 15:17 ` [PATCH v5, part3 15/15] mm: report available pages as "MemTotal" for each NUMA node Jiang Liu
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