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userfaultfd: non-cooperative: dup_userfaultfd: use mm_count instead of mm_users

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Since commit d2005e3f41d4 ("userfaultfd: don't pin the user memory in
userfaultfd_file_create()") userfaultfd uses mm_count rather than
mm_users to pin mm_struct.

Make dup_userfaultfd consistent with this behaviour

Link: http://lkml.kernel.org/r/20161216144821.5183-11-aarcange@redhat.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2017-02-22 15:42:30 -08:00 committed by Linus Torvalds
parent 893e26e61d
commit d3aadc8ed4
1 changed files with 1 additions and 1 deletions
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2
fs/userfaultfd.c
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@ -558,7 +558,7 @@ 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_users);
atomic_inc(&ctx->mm->mm_count);
userfaultfd_ctx_get(octx);
fctx->orig = octx;