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| author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2017-02-25 01:56:05 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-25 04:46:54 +0300 |
| commit | a6bf53eba98e0c36f51322cd6aa771c0ffa283f3 (patch) | |
| tree | c1ccbe8b6c2c89d84c1e4b5d3025209e19b89570 | |
| parent | d811914d87576c562e849c00d9f9beff45038801 (diff) | |
| download | linux-a6bf53eba98e0c36f51322cd6aa771c0ffa283f3.tar.xz | |
userfaultfd: non-cooperative: add madvise() event for MADV_REMOVE request
When a page is removed from a shared mapping, the uffd reader should be
notified, so that it won't attempt to handle #PF events for the removed
pages.
We can reuse the UFFD_EVENT_REMOVE because from the uffd monitor point
of view, the semantices of madvise(MADV_DONTNEED) and
madvise(MADV_REMOVE) is exactly the same.
Link: http://lkml.kernel.org/r/1484814154-1557-3-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/madvise.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index ab5ef141cc9b..0012071a6e50 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -520,6 +520,7 @@ static long madvise_remove(struct vm_area_struct *vma, * mmap_sem. */ get_file(f); + userfaultfd_remove(vma, prev, start, end); up_read(¤t->mm->mmap_sem); error = vfs_fallocate(f, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, |