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memblock: Add memblock_mem_size()

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Use it to get mem size under the limit_pfn.
to replace local version in x86 reserved_initrd.

-v2: remove not needed cast that is pointed out by HPA.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-29-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2013-01-24 12:20:09 -08:00 committed by H. Peter Anvin
parent d1af6d045f
commit 595ad9af85
3 changed files with 19 additions and 15 deletions
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16
arch/x86/kernel/setup.c
View file

@ -363,20 +363,6 @@ static void __init relocate_initrd(void)
ramdisk_here, ramdisk_here + ramdisk_size - 1);
}
static u64 __init get_mem_size(unsigned long limit_pfn)
{
int i;
u64 mapped_pages = 0;
unsigned long start_pfn, end_pfn;
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
mapped_pages += end_pfn - start_pfn;
}
return mapped_pages << PAGE_SHIFT;
}
static void __init early_reserve_initrd(void)
{
/* Assume only end is not page aligned */
@ -404,7 +390,7 @@ static void __init reserve_initrd(void)
initrd_start = 0;
mapped_size = get_mem_size(max_pfn_mapped);
mapped_size = memblock_mem_size(max_pfn_mapped);
if (ramdisk_size >= (mapped_size>>1))
panic("initrd too large to handle, "
"disabling initrd (%lld needed, %lld available)\n",

1
include/linux/memblock.h
View file

@ -155,6 +155,7 @@ phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
phys_addr_t max_addr);
phys_addr_t memblock_phys_mem_size(void);
phys_addr_t memblock_mem_size(unsigned long limit_pfn);
phys_addr_t memblock_start_of_DRAM(void);
phys_addr_t memblock_end_of_DRAM(void);
void memblock_enforce_memory_limit(phys_addr_t memory_limit);

17
mm/memblock.c
View file

@ -828,6 +828,23 @@ phys_addr_t __init memblock_phys_mem_size(void)
return memblock.memory.total_size;
}
phys_addr_t __init memblock_mem_size(unsigned long limit_pfn)
{
unsigned long pages = 0;
struct memblock_region *r;
unsigned long start_pfn, end_pfn;
for_each_memblock(memory, r) {
start_pfn = memblock_region_memory_base_pfn(r);
end_pfn = memblock_region_memory_end_pfn(r);
start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
pages += end_pfn - start_pfn;
}
return (phys_addr_t)pages << PAGE_SHIFT;
}
/* lowest address */
phys_addr_t __init_memblock memblock_start_of_DRAM(void)
{