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| author | Eric Biggers <ebiggers@google.com> | 2021-12-10 16:28:32 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-14 10:03:49 +0100 |
| commit | 2c14047715e0eadee4298bf8e0cc3ca99ef084ff (patch) | |
| tree | d85df97105425335f2659ca5c090c40f7ad147e8 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | 012a74119641e78a49f9a25c6c27f7a3bf4272e1 (diff) | |
signalfd: use wake_up_pollfree()
commit 9537bae0da1f8d1e2361ab6d0479e8af7824e160 upstream.
wake_up_poll() uses nr_exclusive=1, so it's not guaranteed to wake up
all exclusive waiters. Yet, POLLFREE *must* wake up all waiters. epoll
and aio poll are fortunately not affected by this, but it's very
fragile. Thus, the new function wake_up_pollfree() has been introduced.
Convert signalfd to use wake_up_pollfree().
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: d80e731ecab4 ("epoll: introduce POLLFREE to flush ->signalfd_wqh before kfree()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions