For shmem VMAs we can use shmem_mfill_zeropage_pte for UFFDIO_ZEROPAGE
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
---
mm/userfaultfd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 48c015c..8119270 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;
--
2.7.4
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