linux/include/uapi
Marco Elver ddecd22878 perf: uapi: Document perf_event_attr::sig_data truncation on 32 bit architectures
Due to the alignment requirements of siginfo_t, as described in
3ddb3fd8cd ("signal, perf: Fix siginfo_t by avoiding u64 on 32-bit
architectures"), siginfo_t::si_perf_data is limited to an unsigned long.

However, perf_event_attr::sig_data is an u64, to avoid having to deal
with compat conversions. Due to being an u64, it may not immediately be
clear to users that sig_data is truncated on 32 bit architectures.

Add a comment to explicitly point this out, and hopefully help some
users save time by not having to deduce themselves what's happening.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://lore.kernel.org/r/20220131103407.1971678-3-elver@google.com
2022-02-02 13:11:40 +01:00
..
asm-generic mm/mempolicy: wire up syscall set_mempolicy_home_node 2022-01-15 16:30:30 +02:00
drm Merge tag 'amd-drm-next-5.17-2021-12-16' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2021-12-23 11:55:28 +10:00
linux perf: uapi: Document perf_event_attr::sig_data truncation on 32 bit architectures 2022-02-02 13:11:40 +01:00
misc habanalabs: change wait_for_interrupt implementation 2021-12-26 08:59:09 +02:00
mtd mtd: add OTP (one-time-programmable) erase ioctl 2021-03-28 19:24:54 +02:00
rdma RDMA v5.17 merge window pull request 2022-01-13 11:09:11 -08:00
scsi scsi: fc: Add EDC ELS definition 2021-08-24 22:56:33 -04:00
sound ASoC: Updates for v5.17 2022-01-05 15:39:24 +01:00
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