linux-kernel - Re: perf: recursive locking of ctx->mutex

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Date:	Fri, 1 May 2015 16:15:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, jolsa@...hat.com,
	vincent.weaver@...ne.edu
Subject: Re: perf: recursive locking of ctx->mutex

On Fri, May 01, 2015 at 04:13:37PM +0200, Peter Zijlstra wrote:
> 
> A little something like so should cure that me thinks.
> 
> I would much appreciate other people reviewing this with care though; my
> snot addled brain isn't too bright.
> 
> 
> @@ -8728,7 +8753,7 @@ static int perf_event_init_context(struc
>  	 * Lock the parent list. No need to lock the child - not PID
>  	 * hashed yet and not running, so nobody can access it.
>  	 */
> -	mutex_lock(&parent_ctx->mutex);
> +	mutex_lock_nested(&parent_ctx->mutex);
>  
>  	/*
>  	 * We dont have to disable NMIs - we are only looking at

It will help with building to not apply this last hunk..
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