[PATCH RESEND 0/7] switch several architectures NO_BOOTMEM

[PATCH RESEND 0/7] switch several architectures NO_BOOTMEM

[Mike Rapoport]

Hi,

These patches perform conversion to NO_BOOTMEM of hexagon, nios2, uml and
unicore32. The architecture maintainers have acked the patches, but, since
I've got no confirmation the patches are going through the arch tree I'd
appreciate if the set would be applied to the -mm tree.

Mike Rapoport (7):
  hexagon: switch to NO_BOOTMEM
  of: ignore sub-page memory regions
  nios2: use generic early_init_dt_add_memory_arch
  nios2: switch to NO_BOOTMEM
  um: setup_physmem: stop using global variables
  um: switch to NO_BOOTMEM
  unicore32: switch to NO_BOOTMEM

 arch/hexagon/Kconfig      |  3 +++
 arch/hexagon/mm/init.c    | 20 +++++++-----------
 arch/nios2/Kconfig        |  3 +++
 arch/nios2/kernel/prom.c  | 17 ---------------
 arch/nios2/kernel/setup.c | 39 ++++++----------------------------
 arch/um/Kconfig.common    |  2 ++
 arch/um/kernel/physmem.c  | 22 +++++++++----------
 arch/unicore32/Kconfig    |  1 +
 arch/unicore32/mm/init.c  | 54 +----------------------------------------------
 drivers/of/fdt.c          | 11 +++++-----
 10 files changed, 41 insertions(+), 131 deletions(-)

-- 
2.7.4

[PATCH 1/7] hexagon: switch to NO_BOOTMEM

[Mike Rapoport]

This patch adds registration of the system memory with memblock, eliminates
bootmem initialization and converts early memory reservations from bootmem
to memblock.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Richard Kuo <rkuo@codeaurora.org>
---
 arch/hexagon/Kconfig   |  3 +++
 arch/hexagon/mm/init.c | 20 ++++++++------------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 37adb20..66fb2d5 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -28,6 +28,9 @@ config HEXAGON
 	select GENERIC_CLOCKEVENTS_BROADCAST
 	select MODULES_USE_ELF_RELA
 	select GENERIC_CPU_DEVICES
+	select HAVE_MEMBLOCK
+	select ARCH_DISCARD_MEMBLOCK
+	select NO_BOOTMEM
 	---help---
 	  Qualcomm Hexagon is a processor architecture designed for high
 	  performance and low power across a wide variety of applications.
diff --git a/arch/hexagon/mm/init.c b/arch/hexagon/mm/init.c
index 1495d45..d789b9c 100644
--- a/arch/hexagon/mm/init.c
+++ b/arch/hexagon/mm/init.c
@@ -21,6 +21,7 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <asm/atomic.h>
 #include <linux/highmem.h>
 #include <asm/tlb.h>
@@ -176,7 +177,6 @@ size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
 
 void __init setup_arch_memory(void)
 {
-	int bootmap_size;
 	/*  XXX Todo: this probably should be cleaned up  */
 	u32 *segtable = (u32 *) &swapper_pg_dir[0];
 	u32 *segtable_end;
@@ -195,18 +195,22 @@ void __init setup_arch_memory(void)
 	bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
 		~((BIG_KERNEL_PAGE_SIZE) - 1));
 
+	memblock_add(PHYS_OFFSET,
+		     (bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
+
+	/* Reserve kernel text/data/bss */
+	memblock_reserve(PHYS_OFFSET,
+			 (bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
 	/*
 	 * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
 	 * memory allocation
 	 */
-
 	max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
 	min_low_pfn = ARCH_PFN_OFFSET;
-	bootmap_size =  init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
+	memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES);
 
 	printk(KERN_INFO "bootmem_startpg:  0x%08lx\n", bootmem_startpg);
 	printk(KERN_INFO "bootmem_lastpg:  0x%08lx\n", bootmem_lastpg);
-	printk(KERN_INFO "bootmap_size:  %d\n", bootmap_size);
 	printk(KERN_INFO "min_low_pfn:  0x%08lx\n", min_low_pfn);
 	printk(KERN_INFO "max_low_pfn:  0x%08lx\n", max_low_pfn);
 
@@ -257,14 +261,6 @@ void __init setup_arch_memory(void)
 #endif
 
 	/*
-	 * Free all the memory that wasn't taken up by the bootmap, the DMA
-	 * reserve, or kernel itself.
-	 */
-	free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
-		     PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
-		     DMA_RESERVED_BYTES);
-
-	/*
 	 *  The bootmem allocator seemingly just lives to feed memory
 	 *  to the paging system
 	 */
-- 
2.7.4

[PATCH 2/7] of: ignore sub-page memory regions

[Mike Rapoport]

Memory region size is rounded down to page boundary and with sub-page
region it becomes 0 and there is no point to add an empty region.
Moreover, when the base is less than PAGE_SIZE we get a bogus size as
(base + size - 1) evaluates to -1.

The commit 8cccffc52694 ("of: check for size < 0 after rounding in
early_init_dt_add_memory_arch") introduced a test for wrap around for the
case when base is not page aligned, the same test can be used to ignore
sub-page region sizes.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 drivers/of/fdt.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6da20b9..e866745 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1134,12 +1134,13 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
 {
 	const u64 phys_offset = MIN_MEMBLOCK_ADDR;
 
+	if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
+		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
+			base, base + size);
+		return;
+	}
+
 	if (!PAGE_ALIGNED(base)) {
-		if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
-			pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
-				base, base + size);
-			return;
-		}
 		size -= PAGE_SIZE - (base & ~PAGE_MASK);
 		base = PAGE_ALIGN(base);
 	}
-- 
2.7.4

[PATCH 3/7] nios2: use generic early_init_dt_add_memory_arch

[Mike Rapoport]

All we have to do is to enable memblock, the generic FDT code will take
care of the rest.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
---
 arch/nios2/Kconfig        |  1 +
 arch/nios2/kernel/prom.c  | 10 ----------
 arch/nios2/kernel/setup.c |  2 ++
 3 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 3d4ec88..5db8fa1 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -19,6 +19,7 @@ config NIOS2
 	select SPARSE_IRQ
 	select USB_ARCH_HAS_HCD if USB_SUPPORT
 	select CPU_NO_EFFICIENT_FFS
+	select HAVE_MEMBLOCK
 
 config GENERIC_CSUM
 	def_bool y
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c
index 8d7446a..ba96a49 100644
--- a/arch/nios2/kernel/prom.c
+++ b/arch/nios2/kernel/prom.c
@@ -32,16 +32,6 @@
 
 #include <asm/sections.h>
 
-void __init early_init_dt_add_memory_arch(u64 base, u64 size)
-{
-	u64 kernel_start = (u64)virt_to_phys(_text);
-
-	if (!memory_size &&
-	    (kernel_start >= base) && (kernel_start < (base + size)))
-		memory_size = size;
-
-}
-
 int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
 					     bool nomap)
 {
diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index 926a02b..0946840 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -17,6 +17,7 @@
 #include <linux/sched/task.h>
 #include <linux/console.h>
 #include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <linux/initrd.h>
 #include <linux/of_fdt.h>
 #include <linux/screen_info.h>
@@ -147,6 +148,7 @@ void __init setup_arch(char **cmdline_p)
 
 	console_verbose();
 
+	memory_size = memblock_phys_mem_size();
 	memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
 	memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
 
-- 
2.7.4

[PATCH 4/7] nios2: switch to NO_BOOTMEM

[Mike Rapoport]

Remove bootmem bitmap initialization and replace reserve_bootmem() with
memblock_reserve().

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
---
 arch/nios2/Kconfig        |  2 ++
 arch/nios2/kernel/prom.c  |  7 -------
 arch/nios2/kernel/setup.c | 37 +++++--------------------------------
 3 files changed, 7 insertions(+), 39 deletions(-)

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 5db8fa1..661f7f9 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -20,6 +20,8 @@ config NIOS2
 	select USB_ARCH_HAS_HCD if USB_SUPPORT
 	select CPU_NO_EFFICIENT_FFS
 	select HAVE_MEMBLOCK
+	select ARCH_DISCARD_MEMBLOCK
+	select NO_BOOTMEM
 
 config GENERIC_CSUM
 	def_bool y
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c
index ba96a49..a6d4f75 100644
--- a/arch/nios2/kernel/prom.c
+++ b/arch/nios2/kernel/prom.c
@@ -32,13 +32,6 @@
 
 #include <asm/sections.h>
 
-int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
-					     bool nomap)
-{
-	reserve_bootmem(base, size, BOOTMEM_DEFAULT);
-	return 0;
-}
-
 void __init early_init_devtree(void *params)
 {
 	__be32 *dtb = (u32 *)__dtb_start;
diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index 0946840..2d0011d 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -144,10 +144,11 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
 
 void __init setup_arch(char **cmdline_p)
 {
-	int bootmap_size;
+	int dram_start;
 
 	console_verbose();
 
+	dram_start = memblock_start_of_DRAM();
 	memory_size = memblock_phys_mem_size();
 	memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
 	memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
@@ -165,39 +166,11 @@ void __init setup_arch(char **cmdline_p)
 	max_low_pfn = PFN_DOWN(memory_end);
 	max_mapnr = max_low_pfn;
 
-	/*
-	 * give all the memory to the bootmap allocator,  tell it to put the
-	 * boot mem_map at the start of memory
-	 */
-	pr_debug("init_bootmem_node(?,%#lx, %#x, %#lx)\n",
-		min_low_pfn, PFN_DOWN(PHYS_OFFSET), max_low_pfn);
-	bootmap_size = init_bootmem_node(NODE_DATA(0),
-					min_low_pfn, PFN_DOWN(PHYS_OFFSET),
-					max_low_pfn);
-
-	/*
-	 * free the usable memory,  we have to make sure we do not free
-	 * the bootmem bitmap so we then reserve it after freeing it :-)
-	 */
-	pr_debug("free_bootmem(%#lx, %#lx)\n",
-		memory_start, memory_end - memory_start);
-	free_bootmem(memory_start, memory_end - memory_start);
-
-	/*
-	 * Reserve the bootmem bitmap itself as well. We do this in two
-	 * steps (first step was init_bootmem()) because this catches
-	 * the (very unlikely) case of us accidentally initializing the
-	 * bootmem allocator with an invalid RAM area.
-	 *
-	 * Arguments are start, size
-	 */
-	pr_debug("reserve_bootmem(%#lx, %#x)\n", memory_start, bootmap_size);
-	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
-
+	memblock_reserve(dram_start, memory_start - dram_start);
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start) {
-		reserve_bootmem(virt_to_phys((void *)initrd_start),
-				initrd_end - initrd_start, BOOTMEM_DEFAULT);
+		memblock_reserve(virt_to_phys((void *)initrd_start),
+				initrd_end - initrd_start);
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */
 
-- 
2.7.4

[PATCH 5/7] um: setup_physmem: stop using global variables

[Mike Rapoport]

The setup_physmem() function receives uml_physmem and uml_reserved as
parameters and still used these global variables. Replace such usage with
local variables.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Richard Weinberger <richard@nod.at>
---
 arch/um/kernel/physmem.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index f02596e..0eaec0e 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -86,7 +86,7 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 	long map_size;
 	int err;
 
-	offset = uml_reserved - uml_physmem;
+	offset = reserve_end - start;
 	map_size = len - offset;
 	if(map_size <= 0) {
 		os_warn("Too few physical memory! Needed=%lu, given=%lu\n",
@@ -96,12 +96,12 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 
 	physmem_fd = create_mem_file(len + highmem);
 
-	err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
+	err = os_map_memory((void *) reserve_end, physmem_fd, offset,
 			    map_size, 1, 1, 1);
 	if (err < 0) {
 		os_warn("setup_physmem - mapping %ld bytes of memory at 0x%p "
 			"failed - errno = %d\n", map_size,
-			(void *) uml_reserved, err);
+			(void *) reserve_end, err);
 		exit(1);
 	}
 
-- 
2.7.4

[PATCH 6/7] um: switch to NO_BOOTMEM

[Mike Rapoport]

Replace bootmem initialization with memblock_add and memblock_reserve calls
and explicit initialization of {min,max}_low_pfn.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Richard Weinberger <richard@nod.at>
---
 arch/um/Kconfig.common   |  2 ++
 arch/um/kernel/physmem.c | 20 +++++++++-----------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 07f84c8..1487957 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -8,6 +8,8 @@ config UML
 	select HAVE_UID16
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_DEBUG_KMEMLEAK
+	select HAVE_MEMBLOCK
+	select NO_BOOTMEM
 	select GENERIC_IRQ_SHOW
 	select GENERIC_CPU_DEVICES
 	select GENERIC_CLOCKEVENTS
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 0eaec0e..296a91a 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -5,6 +5,7 @@
 
 #include <linux/module.h>
 #include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <linux/mm.h>
 #include <linux/pfn.h>
 #include <asm/page.h>
@@ -80,23 +81,18 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 			  unsigned long len, unsigned long long highmem)
 {
 	unsigned long reserve = reserve_end - start;
-	unsigned long pfn = PFN_UP(__pa(reserve_end));
-	unsigned long delta = (len - reserve) >> PAGE_SHIFT;
-	unsigned long offset, bootmap_size;
-	long map_size;
+	long map_size = len - reserve;
 	int err;
 
-	offset = reserve_end - start;
-	map_size = len - offset;
 	if(map_size <= 0) {
 		os_warn("Too few physical memory! Needed=%lu, given=%lu\n",
-			offset, len);
+			reserve, len);
 		exit(1);
 	}
 
 	physmem_fd = create_mem_file(len + highmem);
 
-	err = os_map_memory((void *) reserve_end, physmem_fd, offset,
+	err = os_map_memory((void *) reserve_end, physmem_fd, reserve,
 			    map_size, 1, 1, 1);
 	if (err < 0) {
 		os_warn("setup_physmem - mapping %ld bytes of memory at 0x%p "
@@ -113,9 +109,11 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 	os_write_file(physmem_fd, __syscall_stub_start, PAGE_SIZE);
 	os_fsync_file(physmem_fd);
 
-	bootmap_size = init_bootmem(pfn, pfn + delta);
-	free_bootmem(__pa(reserve_end) + bootmap_size,
-		     len - bootmap_size - reserve);
+	memblock_add(__pa(start), len + highmem);
+	memblock_reserve(__pa(start), reserve);
+
+	min_low_pfn = PFN_UP(__pa(reserve_end));
+	max_low_pfn = min_low_pfn + (map_size >> PAGE_SHIFT);
 }
 
 int phys_mapping(unsigned long phys, unsigned long long *offset_out)
-- 
2.7.4

[PATCH 7/7] unicore32: switch to NO_BOOTMEM

[Mike Rapoport]

The unicore32 already supports memblock and uses it for some early memory
reservations, e.g initrd and the page tables.

At some point unicore32 allocates the bootmem bitmap from the memblock and
then hands over the memory reservations from memblock to bootmem.

This patch removes the bootmem initialization and leaves memblock as the
only boot time memory manager for unicore32.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Guan Xuetao <gxt@pku.edu.cn>
---
 arch/unicore32/Kconfig   |  1 +
 arch/unicore32/mm/init.c | 54 +-----------------------------------------------
 2 files changed, 2 insertions(+), 53 deletions(-)

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 03f991e..cff4b9d 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -5,6 +5,7 @@ config UNICORE32
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select HAVE_MEMBLOCK
+	select NO_BOOTMEM
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index f4950fb..44ccc15 100644
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -84,58 +84,6 @@ static void __init find_limits(unsigned long *min, unsigned long *max_low,
 	}
 }
 
-static void __init uc32_bootmem_init(unsigned long start_pfn,
-	unsigned long end_pfn)
-{
-	struct memblock_region *reg;
-	unsigned int boot_pages;
-	phys_addr_t bitmap;
-	pg_data_t *pgdat;
-
-	/*
-	 * Allocate the bootmem bitmap page.  This must be in a region
-	 * of memory which has already been mapped.
-	 */
-	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
-	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
-				__pfn_to_phys(end_pfn));
-
-	/*
-	 * Initialise the bootmem allocator, handing the
-	 * memory banks over to bootmem.
-	 */
-	node_set_online(0);
-	pgdat = NODE_DATA(0);
-	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
-
-	/* Free the lowmem regions from memblock into bootmem. */
-	for_each_memblock(memory, reg) {
-		unsigned long start = memblock_region_memory_base_pfn(reg);
-		unsigned long end = memblock_region_memory_end_pfn(reg);
-
-		if (end >= end_pfn)
-			end = end_pfn;
-		if (start >= end)
-			break;
-
-		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
-	}
-
-	/* Reserve the lowmem memblock reserved regions in bootmem. */
-	for_each_memblock(reserved, reg) {
-		unsigned long start = memblock_region_reserved_base_pfn(reg);
-		unsigned long end = memblock_region_reserved_end_pfn(reg);
-
-		if (end >= end_pfn)
-			end = end_pfn;
-		if (start >= end)
-			break;
-
-		reserve_bootmem(__pfn_to_phys(start),
-			(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
-	}
-}
-
 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
 	unsigned long max_high)
 {
@@ -232,7 +180,7 @@ void __init bootmem_init(void)
 
 	find_limits(&min, &max_low, &max_high);
 
-	uc32_bootmem_init(min, max_low);
+	node_set_online(0);
 
 #ifdef CONFIG_SWIOTLB
 	swiotlb_init(1);
-- 
2.7.4

Re: [PATCH RESEND 0/7] switch several architectures NO_BOOTMEM

[Mike Rapoport]

Any updates on this?

On Fri, Aug 03, 2018 at 10:58:43PM +0300, Mike Rapoport wrote:
> 
> Hi,
> 
> These patches perform conversion to NO_BOOTMEM of hexagon, nios2, uml and
> unicore32. The architecture maintainers have acked the patches, but, since
> I've got no confirmation the patches are going through the arch tree I'd
> appreciate if the set would be applied to the -mm tree.
> 
> Mike Rapoport (7):
>   hexagon: switch to NO_BOOTMEM
>   of: ignore sub-page memory regions
>   nios2: use generic early_init_dt_add_memory_arch
>   nios2: switch to NO_BOOTMEM
>   um: setup_physmem: stop using global variables
>   um: switch to NO_BOOTMEM
>   unicore32: switch to NO_BOOTMEM
> 
>  arch/hexagon/Kconfig      |  3 +++
>  arch/hexagon/mm/init.c    | 20 +++++++-----------
>  arch/nios2/Kconfig        |  3 +++
>  arch/nios2/kernel/prom.c  | 17 ---------------
>  arch/nios2/kernel/setup.c | 39 ++++++----------------------------
>  arch/um/Kconfig.common    |  2 ++
>  arch/um/kernel/physmem.c  | 22 +++++++++----------
>  arch/unicore32/Kconfig    |  1 +
>  arch/unicore32/mm/init.c  | 54 +----------------------------------------------
>  drivers/of/fdt.c          | 11 +++++-----
>  10 files changed, 41 insertions(+), 131 deletions(-)
> 
> -- 
> 2.7.4
> 

-- 
Sincerely yours,
Mike.