Merge "perf: Cancel the mux hrtimer during CPU hotplug to avoid migration"

	int				capabilities;

	int * __percpu			pmu_disable_count;

	struct perf_cpu_context * __percpu pmu_cpu_context;

	struct perf_cpu_context __percpu *pmu_cpu_context;

	atomic_t			exclusive_cnt; /* < 0: cpu; > 0: tsk */

	int				task_ctx_nr;

	int				hrtimer_interval_ms;

static void perf_event_exit_cpu_context(int cpu)

{

	struct perf_cpu_context *cpuctx;

	struct perf_event_context *ctx;

	unsigned long flags;

	struct pmu *pmu;

	int idx;

	idx = srcu_read_lock(&pmus_srcu);

	list_for_each_entry_rcu(pmu, &pmus, entry) {

		ctx = &per_cpu_ptr(pmu->pmu_cpu_context, cpu)->ctx;

		cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);

		ctx = &cpuctx->ctx;

		/* Cancel the mux hrtimer to avoid CPU migration */

		if (pmu->task_ctx_nr != perf_sw_context) {

			raw_spin_lock_irqsave(&cpuctx->hrtimer_lock, flags);

			hrtimer_cancel(&cpuctx->hrtimer);

			cpuctx->hrtimer_active = 0;

			raw_spin_unlock_irqrestore(&cpuctx->hrtimer_lock,

							flags);

		}

		mutex_lock(&ctx->mutex);

		smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1);