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authorJohannes Weiner <hannes@cmpxchg.org>2011-01-14 02:47:04 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-14 04:32:44 +0300
commitcd7548ab360c462118568eebb8c6da3bc303b02e (patch)
tree44d145e6139c8753659ee773ae35810dc3d92d0b /include
parentb36f5b0710e9e3b92484de32920fddcb17278664 (diff)
downloadlinux-cd7548ab360c462118568eebb8c6da3bc303b02e.tar.xz
thp: mprotect: transparent huge page support
Natively handle huge pmds when changing page tables on behalf of mprotect(). I left out update_mmu_cache() because we do not need it on x86 anyway but more importantly the interface works on ptes, not pmds. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/huge_mm.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 25125fb6acf7..c590b08c6fa6 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -22,6 +22,8 @@ extern int zap_huge_pmd(struct mmu_gather *tlb,
extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned char *vec);
+extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
+ unsigned long addr, pgprot_t newprot);
enum transparent_hugepage_flag {
TRANSPARENT_HUGEPAGE_FLAG,