Peter Zijlstra 1688acf477 perf/core: Fix pmus_lock vs. pmus_srcu ordering ...

[ Upstream commit 2565e42539 ]

Commit a63fbed776 ("perf/tracing/cpuhotplug: Fix locking order")
placed pmus_lock inside pmus_srcu, this makes perf_pmu_unregister()
trip lockdep.

Move the locking about such that only pmu_idr and pmus (list) are
modified while holding pmus_lock. This avoids doing synchronize_srcu()
while holding pmus_lock and all is well again.

Fixes: a63fbed776 ("perf/tracing/cpuhotplug: Fix locking order")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241104135517.679556858@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-03-13 13:02:04 +01:00

..

callchain.c

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core.c

perf/core: Fix pmus_lock vs. pmus_srcu ordering

2025-03-13 13:02:04 +01:00

hw_breakpoint_test.c

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hw_breakpoint.c

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internal.h

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Makefile

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ring_buffer.c

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uprobes.c

uprobes: Reject the shared zeropage in uprobe_write_opcode()

2025-03-07 18:25:34 +01:00