6.6-stable review patch. If anyone has any objections, please let me know.
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From: Peter Zijlstra peterz@infradead.org
[ Upstream commit 558abc7e3f895049faa46b08656be4c60dc6e9fd ]
All the event_function/@func call context already uses perf_ctx_lock() except for the !ctx->is_active case. Make it all consistent.
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Reviewed-by: Kan Liang kan.liang@linux.intel.com Reviewed-by: Namhyung Kim namhyung@kernel.org Link: https://lore.kernel.org/r/20240807115550.138301094@infradead.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/events/core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index d40809bdf4b30..18eab7f50ecce 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -263,6 +263,7 @@ static int event_function(void *info) static void event_function_call(struct perf_event *event, event_f func, void *data) { struct perf_event_context *ctx = event->ctx; + struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context); struct task_struct *task = READ_ONCE(ctx->task); /* verified in event_function */ struct event_function_struct efs = { .event = event, @@ -291,22 +292,22 @@ static void event_function_call(struct perf_event *event, event_f func, void *da if (!task_function_call(task, event_function, &efs)) return;
- raw_spin_lock_irq(&ctx->lock); + perf_ctx_lock(cpuctx, ctx); /* * Reload the task pointer, it might have been changed by * a concurrent perf_event_context_sched_out(). */ task = ctx->task; if (task == TASK_TOMBSTONE) { - raw_spin_unlock_irq(&ctx->lock); + perf_ctx_unlock(cpuctx, ctx); return; } if (ctx->is_active) { - raw_spin_unlock_irq(&ctx->lock); + perf_ctx_unlock(cpuctx, ctx); goto again; } func(event, NULL, ctx, data); - raw_spin_unlock_irq(&ctx->lock); + perf_ctx_unlock(cpuctx, ctx); }
/*