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authorMike Rapoport <rppt@linux.vnet.ibm.com>2017-09-07 02:23:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 03:27:28 +0300
commit8fb44e5403ca86e33411dfa12dd298ed5ab1c3f7 (patch)
treec7fb42bdc95f97eaf230619cf9773ed808dadd26 /mm
parent3217d3c79b5d7aabf62daa4db8cf757abedc9f28 (diff)
downloadlinux-8fb44e5403ca86e33411dfa12dd298ed5ab1c3f7.tar.xz
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 <rppt@linux.vnet.ibm.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Pavel Emelyanov <xemul@virtuozzo.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/userfaultfd.c6
1 files 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;