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userfaultfd: use mmgrab instead of open-coded increment of mm_count

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Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: "Dr . David Alan Gilbert" <[email protected]>
Cc: Mike Kravetz <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Rapoport 2017-11-15 17:36:56 -08:00 • committed by Linus Torvalds
commit 00bb31fa44
1 changed files with 1 additions and 1 deletions
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fs/userfaultfd.c
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@ -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;