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SubjectRe: [PATCH 5/5] perf/arm_dsu: Fix CPU hotplug races

On 04/02/2019 17:09, Robin Murphy wrote:
> Like other system PMUs which associate themselves with an arbitrary CPU
> for housekeeping purposes, arm_dsu has a race between registering the
> hotplug notifier and registering the PMU device, such that the hotplug
> niotifier can potentially fire and attempt to migrate the PMU context
> before the latter is valid. This is easily resolved by inhibiting
> hotplug until both the notifier and PMU device are successfully set up.
> For the same reason, also suppress any synchronous notifier calls in the
> cleanup path if PMU registration fails.
> Signed-off-by: Robin Murphy <>

Should we add :

Fixes: commit 7520fa99246dade7ab6 ("perf: ARM DynamIQ Shared Unit PMU support")

Either way:

Reviewed-by: Suzuki K Poulose <>

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