Commit 14fd403f authored by Andrea Arcangeli's avatar Andrea Arcangeli Committed by Linus Torvalds

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: default avatarAndrea Arcangeli <aarcange@redhat.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Acked-by: default avatarMel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2609ae6d
...@@ -429,6 +429,19 @@ static inline void set_compound_order(struct page *page, unsigned long order) ...@@ -429,6 +429,19 @@ static inline void set_compound_order(struct page *page, unsigned long order)
page[1].lru.prev = (void *)order; page[1].lru.prev = (void *)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 * Multiple processes may "see" the same page. E.g. for untouched
* mappings of /dev/null, all processes see the same page full of * mappings of /dev/null, all processes see the same page full of
......
...@@ -2083,19 +2083,6 @@ static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd, ...@@ -2083,19 +2083,6 @@ static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
return same; return same;
} }
/*
* 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;
}
static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va, struct vm_area_struct *vma) static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va, struct vm_area_struct *vma)
{ {
/* /*
......
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