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| author | Tao Chen <chen.dylane@linux.dev> | 2025-03-14 11:00:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:30:56 +0200 |
| commit | ef0398cf5cf150364839ffea0b0dd7c71edf2e62 (patch) | |
| tree | 2600402e6f8b076d3d75581b0cf30598faea1823 /kernel | |
| parent | 93dea41fd6c652b2d7b455f360502de73956d2a8 (diff) | |
| download | linux-ef0398cf5cf150364839ffea0b0dd7c71edf2e62.tar.gz linux-ef0398cf5cf150364839ffea0b0dd7c71edf2e62.tar.bz2 linux-ef0398cf5cf150364839ffea0b0dd7c71edf2e62.zip | |
perf/ring_buffer: Allow the EPOLLRDNORM flag for poll
[ Upstream commit c96fff391c095c11dc87dab35be72dee7d217cde ]
The poll man page says POLLRDNORM is equivalent to POLLIN. For poll(),
it seems that if user sets pollfd with POLLRDNORM in userspace, perf_poll
will not return until timeout even if perf_output_wakeup called,
whereas POLLIN returns.
Fixes: 76369139ceb9 ("perf: Split up buffer handling from core code")
Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250314030036.2543180-1-chen.dylane@linux.dev
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/ring_buffer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index ffca72b8c4c6..74802ec5ab14 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -19,7 +19,7 @@ static void perf_output_wakeup(struct perf_output_handle *handle) { - atomic_set(&handle->rb->poll, EPOLLIN); + atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM); handle->event->pending_wakeup = 1; irq_work_queue(&handle->event->pending); |