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userfaultfd: use mmgrab instead of open-coded increment of mm_count
[sfrench/cifs-2.6.git]
/
fs
/
userfaultfd.c
diff --git
a/fs/userfaultfd.c
b/fs/userfaultfd.c
index f46d133c094998c48eada7a4e2bd8f5a69239ffa..ac9a4e65ca497ad3b673dc50893d13b44150c70f 100644
(file)
--- a/
fs/userfaultfd.c
+++ b/
fs/userfaultfd.c
@@
-668,7
+668,7
@@
int dup_userfaultfd(struct vm_area_struct *vma, struct list_head *fcs)
ctx->features = octx->features;
ctx->released = false;
ctx->mm = vma->vm_mm;
-
atomic_inc(&ctx->mm->mm_count
);
+
mmgrab(ctx->mm
);
userfaultfd_ctx_get(octx);
fctx->orig = octx;