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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 <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Yinghai Lu 2013-01-24 12:20:09 -08:00 • committed by H. Peter Anvin
commit 595ad9af85
3 changed files with 19 additions and 15 deletions
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17
mm/memblock.c
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@ -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)
{