Peter Zijlstra 52d13d224f perf/aux: Fix AUX buffer serialization ...

commit 2ab9d83026 upstream.

Ole reported that event->mmap_mutex is strictly insufficient to
serialize the AUX buffer, add a per RB mutex to fully serialize it.

Note that in the lock order comment the perf_event::mmap_mutex order
was already wrong, that is, it nesting under mmap_lock is not new with
this patch.

Fixes: 45bfb2e504 ("perf: Add AUX area to ring buffer for raw data streams")
Reported-by: Ole <ole@binarygecko.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2024-09-12 11:07:51 +02:00

..

callchain.c

…

core.c

perf/aux: Fix AUX buffer serialization

2024-09-12 11:07:51 +02:00

hw_breakpoint.c

…

internal.h

perf/aux: Fix AUX buffer serialization

2024-09-12 11:07:51 +02:00

Makefile

…

ring_buffer.c

perf/aux: Fix AUX buffer serialization

2024-09-12 11:07:51 +02:00

uprobes.c

uprobes: Use kzalloc to allocate xol area

2024-09-12 11:07:51 +02:00