diff options
author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-13 23:46:37 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-14 01:32:39 (GMT) |
commit | 14fd403f2146f740942d78af4e0ee59396ad8eab (patch) | |
tree | c87734f6c6639684208d36548aa3687c6f460e23 /include/linux/mm.h | |
parent | 2609ae6d10af0531e826335bd1445d1ace17c847 (diff) | |
download | linux-fsl-qoriq-14fd403f2146f740942d78af4e0ee59396ad8eab.tar.xz |
thp: export maybe_mkwrite
huge_memory.c needs it too when it fallbacks in copying hugepages into
regular fragmented pages if hugepage allocation fails during COW.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r-- | include/linux/mm.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index a2718e1..6bef67d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -430,6 +430,19 @@ static inline void set_compound_order(struct page *page, unsigned long order) } /* + * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when + * servicing faults for write access. In the normal case, do always want + * pte_mkwrite. But get_user_pages can cause write faults for mappings + * that do not have writing enabled, when used by access_process_vm. + */ +static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) +{ + if (likely(vma->vm_flags & VM_WRITE)) + pte = pte_mkwrite(pte); + return pte; +} + +/* * Multiple processes may "see" the same page. E.g. for untouched * mappings of /dev/null, all processes see the same page full of * zeroes, and text pages of executables and shared libraries have |