From 7c414164593514f76b422faae0824bdd3754209b Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Tue, 8 Sep 2015 14:58:43 -0700 Subject: [PATCH] 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 Cc: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 4d5fcb630d32..ca475dfdb28f 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, -- 2.20.1