diff options
| author | Andrew Morton <akpm@linux-foundation.org> | 2015-09-08 21:58:43 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 22:35:28 (GMT) |
| commit | 7c414164593514f76b422faae0824bdd3754209b (patch) | |
| tree | df57f73dca79d9646eb839b0dff8a71b48929b45 /mm | |
| parent | c94c2acf84dc16cf4b989bb0bc849785b7ff52f5 (diff) | |
| download | linux-7c414164593514f76b422faae0824bdd3754209b.tar.xz | |
dax: revert userfaultfd change
Undo the change which "userfaultfd: call handle_userfault() for
userfaultfd_missing() faults" made to set_huge_zero_page(). DAX will
need that return value.
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 4d5fcb6..ca475df 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -794,16 +794,19 @@ static inline gfp_t alloc_hugepage_gfpmask(int defrag, gfp_t extra_gfp) } /* Caller must hold page table lock. */ -static void set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, +static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, struct vm_area_struct *vma, unsigned long haddr, pmd_t *pmd, struct page *zero_page) { pmd_t entry; + if (!pmd_none(*pmd)) + return false; entry = mk_pmd(zero_page, vma->vm_page_prot); entry = pmd_mkhuge(entry); pgtable_trans_huge_deposit(mm, pmd, pgtable); set_pmd_at(mm, haddr, pmd, entry); atomic_long_inc(&mm->nr_ptes); + return true; } int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, |