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Tao Chen f343b44202 perf/ring_buffer: Allow the EPOLLRDNORM flag for poll 
[ Upstream commit c96fff391c ]

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: 76369139ce ("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>
History 2025-04-10 14:31:57 +02:00
..
callchain.c uaccess: add force_uaccess_{begin,end} helpers 2020-08-12 10:57:59 -07:00
core.c perf/core: Fix low freq setting via IOC_PERIOD 2025-03-13 12:50:59 +01:00
hw_breakpoint.c perf/hw_breakpoint: Replace deprecated CPU-hotplug functions 2021-08-26 09:14:36 +02:00
internal.h perf/aux: Fix AUX buffer serialization 2024-09-12 11:07:51 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ring_buffer.c perf/ring_buffer: Allow the EPOLLRDNORM flag for poll 2025-04-10 14:31:57 +02:00
uprobes.c uprobes: fix kernel info leak via "[uprobes]" vma 2024-10-17 15:11:45 +02:00