Re: [PATCH 2/2] drivers: perf: arm_pmu: Drop 'pmu_lock' element from 'struct pmu_hw_events'

[Mark Rutland]

On Wed, Nov 15, 2023 at 02:58:05PM +0530, Anshuman Khandual wrote:
> As 'pmu_lock' element is not being used in any ARM PMU implementation, just
> drop this from 'struct pmu_hw_events'.
> 
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>

Acked-by: Mark Rutland <mark.rutland@xxxxxxx>

Mark.

> ---
>  drivers/perf/arm_pmu.c       | 1 -
>  include/linux/perf/arm_pmu.h | 6 ------
>  2 files changed, 7 deletions(-)
> 
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index d712a19e47ac..379479b50bdd 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -893,7 +893,6 @@ struct arm_pmu *armpmu_alloc(void)
>  		struct pmu_hw_events *events;
>  
>  		events = per_cpu_ptr(pmu->hw_events, cpu);
> -		raw_spin_lock_init(&events->pmu_lock);
>  		events->percpu_pmu = pmu;
>  	}
>  
> diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
> index 143fbc10ecfe..e2503d48ddee 100644
> --- a/include/linux/perf/arm_pmu.h
> +++ b/include/linux/perf/arm_pmu.h
> @@ -59,12 +59,6 @@ struct pmu_hw_events {
>  	 */
>  	DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS);
>  
> -	/*
> -	 * Hardware lock to serialize accesses to PMU registers. Needed for the
> -	 * read/modify/write sequences.
> -	 */
> -	raw_spinlock_t		pmu_lock;
> -
>  	/*
>  	 * When using percpu IRQs, we need a percpu dev_id. Place it here as we
>  	 * already have to allocate this struct per cpu.
> -- 
> 2.25.1
>