[PATCH 5/7] userfaultfd: shmem: wire up shmem_mfill_zeropage_pte

[Mike Rapoport]

For shmem VMAs we can use shmem_mfill_zeropage_pte for UFFDIO_ZEROPAGE

Signed-off-by: Mike Rapoport <r...@linux.vnet.ibm.com>
---
 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