Adrian Hunter e1e354a2cd perf: Fix default aux_watermark calculation ...

[ Upstream commit 43deb76b19 ]

The default aux_watermark is half the AUX area buffer size. In general,
on a 64-bit architecture, the AUX area buffer size could be a bigger than
fits in a 32-bit type, but the calculation does not allow for that
possibility.

However the aux_watermark value is recorded in a u32, so should not be
more than U32_MAX either.

Fix by doing the calculation in a correctly sized type, and limiting the
result to U32_MAX.

Fixes: d68e6799a5 ("perf: Cap allocation order at aux_watermark")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240624201101.60186-7-adrian.hunter@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-08-19 05:44:58 +02:00

..

callchain.c

…

core.c

perf: Prevent passing zero nr_pages to rb_alloc_aux()

2024-08-19 05:44:58 +02:00

hw_breakpoint.c

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internal.h

perf: Fix perf_aux_size() for greater-than 32-bit size

2024-08-19 05:44:58 +02:00

Makefile

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ring_buffer.c

perf: Fix default aux_watermark calculation

2024-08-19 05:44:58 +02:00

uprobes.c

…