linux-kernel - Re: [PATCH 06/19] kernel: convert perf_event_context.refcount from atomic_t to refcount

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Message-ID: <20170220102825.GL6500@twins.programming.kicks-ass.net>
Date:   Mon, 20 Feb 2017 11:28:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Elena Reshetova <elena.reshetova@...el.com>
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-audit@...hat.com, linux-fsdevel@...r.kernel.org,
        gregkh@...uxfoundation.org, viro@...iv.linux.org.uk, tj@...nel.org,
        mingo@...hat.com, hannes@...xchg.org, lizefan@...wei.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        paul@...l-moore.com, eparis@...hat.com, akpm@...ux-foundation.org,
        arnd@...db.de, luto@...nel.org,
        Hans Liljestrand <ishkamiel@...il.com>,
        Kees Cook <keescook@...omium.org>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 06/19] kernel: convert perf_event_context.refcount from
 atomic_t to refcount_t

On Mon, Feb 20, 2017 at 12:18:55PM +0200, Elena Reshetova wrote:
> +++ b/kernel/events/core.c
> @@ -1108,7 +1108,7 @@ static void perf_event_ctx_deactivate(struct perf_event_context *ctx)
>  
>  static void get_ctx(struct perf_event_context *ctx)
>  {
> -	WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
> +	WARN_ON(!refcount_inc_not_zero(&ctx->refcount));
>  }

You can change that to refcount_inc(), as that has the exact same
semantics.