[PATCH 2/4] perf/core: convert call_rcu(free_ctx) to kfree_rcu()

[Ran Xiaokai]

From: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>

The rcu callback free_ctx() simply calls kfree().
It's better to directly call kfree_rcu().

Signed-off-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
---
 kernel/events/core.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 065f9188b44a..7f4cc9c41bbe 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1210,14 +1210,6 @@ static void free_task_ctx_data(struct pmu *pmu, void *task_ctx_data)
 		kmem_cache_free(pmu->task_ctx_cache, task_ctx_data);
 }
 
-static void free_ctx(struct rcu_head *head)
-{
-	struct perf_event_context *ctx;
-
-	ctx = container_of(head, struct perf_event_context, rcu_head);
-	kfree(ctx);
-}
-
 static void put_ctx(struct perf_event_context *ctx)
 {
 	if (refcount_dec_and_test(&ctx->refcount)) {
@@ -1225,7 +1217,7 @@ static void put_ctx(struct perf_event_context *ctx)
 			put_ctx(ctx->parent_ctx);
 		if (ctx->task && ctx->task != TASK_TOMBSTONE)
 			put_task_struct(ctx->task);
-		call_rcu(&ctx->rcu_head, free_ctx);
+		kfree_rcu(ctx, rcu_head);
 	}
 }
 
-- 
2.17.1