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-rw-r--r--include/linux/mm.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a2718e1ed585..6bef67d74adf 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)
430} 430}
431 431
432/* 432/*
433 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
434 * servicing faults for write access. In the normal case, do always want
435 * pte_mkwrite. But get_user_pages can cause write faults for mappings
436 * that do not have writing enabled, when used by access_process_vm.
437 */
438static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
439{
440 if (likely(vma->vm_flags & VM_WRITE))
441 pte = pte_mkwrite(pte);
442 return pte;
443}
444
445/*
433 * Multiple processes may "see" the same page. E.g. for untouched 446 * Multiple processes may "see" the same page. E.g. for untouched
434 * mappings of /dev/null, all processes see the same page full of 447 * mappings of /dev/null, all processes see the same page full of
435 * zeroes, and text pages of executables and shared libraries have 448 * zeroes, and text pages of executables and shared libraries have