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| author | Pavel Begunkov <asml.silence@gmail.com> | 2022-06-20 02:25:55 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-25 02:39:14 +0200 |
| commit | 305bef98870816ae58357d647521891ec558a92e (patch) | |
| tree | 48bd36c78596cd1775b197586d237e8a2bb90524 /include/net | |
| parent | io_uring: fix io_poll_remove_all clang warnings (diff) | |
| download | linux-305bef98870816ae58357d647521891ec558a92e.tar.xz linux-305bef98870816ae58357d647521891ec558a92e.zip | |
io_uring: hide eventfd assumptions in eventfd paths
Some io_uring-eventfd users assume that there won't be spurious wakeups.
That assumption has to be honoured by all io_cqring_ev_posted() callers,
which is inconvenient and from time to time leads to problems but should
be maintained to not break the userspace.
Instead of making the callers track whether a CQE was posted or not, hide
it inside io_eventfd_signal(). It saves ->cached_cq_tail it saw last time
and triggers the eventfd only when ->cached_cq_tail changed since then.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0ffc66bae37a2513080b601e4370e147faaa72c5.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/net')
0 files changed, 0 insertions, 0 deletions