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| author |   Pavel Begunkov <asml.silence@gmail.com> | 2021-01-07 03:15:43 +0000 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-01-07 07:48:09 -0700 |
| commit | b1445e59cc9a10fdb8f83810ae1f4feb941ab36b (patch) | |
| tree | 3f7ec8dc6d43cbc0baf2b2d33824ba266e0aea0d /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | io_uring: dont kill fasync under completion_lock (diff) | |
| download | wireguard-linux-b1445e59cc9a10fdb8f83810ae1f4feb941ab36b.tar.xz wireguard-linux-b1445e59cc9a10fdb8f83810ae1f4feb941ab36b.zip | |
io_uring: synchronise ev_posted() with waitqueues
waitqueue_active() needs smp_mb() to be in sync with waitqueues
modification, but we miss it in io_cqring_ev_posted*() apart from
cq_wait() case.
Take an smb_mb() out of wq_has_sleeper() making it waitqueue_active(),
and place it a few lines before, so it can synchronise other
waitqueue_active() as well.
The patch doesn't add any additional overhead, so even if there are
no problems currently, it's just safer to have it this way.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions