forked from luck/tmp_suning_uos_patched
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>
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@ -429,6 +429,19 @@ static inline void set_compound_order(struct page *page, unsigned long order)
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page[1].lru.prev = (void *)order;
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}
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/*
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* Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
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* servicing faults for write access. In the normal case, do always want
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* pte_mkwrite. But get_user_pages can cause write faults for mappings
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* that do not have writing enabled, when used by access_process_vm.
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*/
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static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
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{
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if (likely(vma->vm_flags & VM_WRITE))
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pte = pte_mkwrite(pte);
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return pte;
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}
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/*
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* Multiple processes may "see" the same page. E.g. for untouched
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* mappings of /dev/null, all processes see the same page full of
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13
mm/memory.c
13
mm/memory.c
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@ -2083,19 +2083,6 @@ static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
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return same;
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}
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/*
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* Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
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* servicing faults for write access. In the normal case, do always want
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* pte_mkwrite. But get_user_pages can cause write faults for mappings
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* that do not have writing enabled, when used by access_process_vm.
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*/
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static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
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{
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if (likely(vma->vm_flags & VM_WRITE))
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pte = pte_mkwrite(pte);
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return pte;
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}
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static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va, struct vm_area_struct *vma)
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{
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/*
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