arm: perf: fold hotplug notifier into arm_pmu

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Handling multiple PMUs using a single hotplug notifier requires a list
of PMUs to be maintained, with synchronisation in the probe, remove, and
notify paths. This is error-prone and makes the code much harder to
maintain.

Instead of using a single notifier, we can dynamically allocate a
notifier block per-PMU. The end result is the same, but the list of PMUs
is implicit in the hotplug notifier list rather than within a perf-local
data structure, which makes the code far easier to handle.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Mark Rutland 2014-10-23 15:23:35 +01:00 • committed by Will Deacon

parent abdf655a30

commit af66abfe2e

2 changed files with 35 additions and 35 deletions

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arch/arm/include/asm/pmu.h

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69

arch/arm/kernel/perf_event_cpu.c

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