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authorYinghai Lu <yinghai@kernel.org>2012-11-17 07:38:54 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2012-11-17 23:59:15 +0400
commit960ddb4fe7832b559897e8b26ec805839b706905 (patch)
tree92e7cf34c23f263ff50ddd7ca3bfc14f42d30312 /arch/x86/mm/init_32.c
parent74f27655dda84604d8bab47872020dcce5c88731 (diff)
downloadlinux-960ddb4fe7832b559897e8b26ec805839b706905.tar.xz
x86, mm: Align start address to correct big page size
We are going to use buffer in BRK to map small range just under memory top, and use those new mapped ram to map ram range under it. The ram range that will be mapped at first could be only page aligned, but ranges around it are ram too, we could use bigger page to map it to avoid small page size. We will adjust page_size_mask in following patch: x86, mm: Use big page size for small memory range to use big page size for small ram range. Before that patch, this patch will make sure start address to be aligned down according to bigger page size, otherwise entry in page page will not have correct value. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Link: http://lkml.kernel.org/r/1353123563-3103-18-git-send-email-yinghai@kernel.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm/init_32.c')
-rw-r--r--arch/x86/mm/init_32.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 11a58001b4ce..27f7fc69cf8a 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -310,6 +310,7 @@ repeat:
__pgprot(PTE_IDENT_ATTR |
_PAGE_PSE);
+ pfn &= PMD_MASK >> PAGE_SHIFT;
addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
PAGE_OFFSET + PAGE_SIZE-1;