From 8fb44e5403ca86e33411dfa12dd298ed5ab1c3f7 Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Wed, 6 Sep 2017 16:23:09 -0700 Subject: [PATCH] userfaultfd: shmem: wire up shmem_mfill_zeropage_pte For shmem VMAs we can use shmem_mfill_zeropage_pte for UFFDIO_ZEROPAGE Link: http://lkml.kernel.org/r/1497939652-16528-6-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport Cc: "Kirill A. Shutemov" Cc: Andrea Arcangeli Cc: Hillf Danton Cc: Hugh Dickins Cc: Pavel Emelyanov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/userfaultfd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 48c015c80120..81192701964d 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -389,11 +389,13 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm, err = mfill_zeropage_pte(dst_mm, dst_pmd, dst_vma, dst_addr); } else { - err = -EINVAL; /* if zeropage is true return -EINVAL */ - if (likely(!zeropage)) + if (!zeropage) err = shmem_mcopy_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, src_addr, page); + else + err = shmem_mfill_zeropage_pte(dst_mm, dst_pmd, + dst_vma, dst_addr); } return err;