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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2012-12-12 13:50:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 17:38:31 -0800
commit93b4796dede916de74b21fbd637588da6a99a7ec (patch)
tree3833de6051bb1b8d361a614743aafa56b43902e1 /mm/memory.c
parentfc9fe822f7112db23e51e2be3b886f5d8f0afdb6 (diff)
downloadlinux-93b4796dede916de74b21fbd637588da6a99a7ec.tar.gz
thp: do_huge_pmd_wp_page(): handle huge zero page
On write access to huge zero page we alloc a new huge page and clear it. If ENOMEM, graceful fallback: we create a new pmd table and set pte around fault address to newly allocated normal (4k) page. All other ptes in the pmd set to normal zero page. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 76537738563..259b34fe134 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -724,13 +724,6 @@ static inline int is_zero_pfn(unsigned long pfn)
}
#endif
-#ifndef my_zero_pfn
-static inline unsigned long my_zero_pfn(unsigned long addr)
-{
- return zero_pfn;
-}
-#endif
-
/*
* vm_normal_page -- This function gets the "struct page" associated with a pte.
*