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SubjectRe: [PATCH 26/36] perf,rcu: convert call_rcu(free_ctx) to kfree_rcu()
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On Fri, 2011-03-18 at 12:07 +0800, Lai Jiangshan wrote:
>
> The rcu callback free_ctx() just calls a kfree(),
> so we use kfree_rcu() instead of the call_rcu(free_ctx).
>
> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

Please take them through whatever tree adds kfree_rcu() as that doesn't
seem to be part of any tree near me.

> ---
> kernel/perf_event.c | 10 +---------
> 1 files changed, 1 insertions(+), 9 deletions(-)
>
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index ed253aa..b0581bd 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -584,14 +584,6 @@ static void get_ctx(struct perf_event_context *ctx)
> WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
> }
>
> -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 (atomic_dec_and_test(&ctx->refcount)) {
> @@ -599,7 +591,7 @@ static void put_ctx(struct perf_event_context *ctx)
> put_ctx(ctx->parent_ctx);
> if (ctx->task)
> put_task_struct(ctx->task);
> - call_rcu(&ctx->rcu_head, free_ctx);
> + kfree_rcu(ctx, rcu_head);
> }
> }
>



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