Re: [RFC PATCH 15/49] perf/amd/ibs: Move CPUHP_AP_PERF_X86_AMD_IBS_STARTING post stop_machine()

[sashiko-bot@kernel.org]

> Between CPUHP_TEARDOWN_CPU and CPUHP_AP_OFFLINE, stop_machine executes
> all the teardown callbacks while stopping all CPUs in the system. This
> doesn't mix-up well with running RT or isolated tasks.
> 
> In order to transition smoothly from global stop_machine to finer
> grained synchronization between teardown callbacks and the other CPUs,
> a new stop machine post function has been introduced to be executed
> after the main one with IRQs still disabled while other CPUs can exit
> stop_machine().
> 
> Here the callback only restores the IBS interrupt to the normal priority
> on the local APIC and running it concurrently against other CPUs
> shouldn't expose any kind of race.
> 
> Move this teardown callback to post stop_machine() accordingly.
> 
> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

Sashiko has reviewed this patch and found no issues.

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