linux-kernel - Re: [PATCH v2 12/12] sched: Add preempt

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Date:	Wed, 30 Sep 2015 05:38:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, fweisbec@...il.com, oleg@...hat.com,
	umgwanakikbuti@...il.com, tglx@...utronix.de
Subject: Re: [PATCH v2 12/12] sched: Add preempt_count invariant check

On Wed, 30 Sep 2015 09:10:47 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> Ingo requested I keep my debug check for the preempt_count invariant.
> 
> Requested-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  kernel/sched/core.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2514,6 +2514,10 @@ static struct rq *finish_task_switch(str
>  	 *
>  	 * Also, see FORK_PREEMPT_COUNT.
>  	 */
> +	if (unlikely(WARN_ONCE(preempt_count() != 2*PREEMPT_DISABLE_OFFSET,

Nuke the "unlikely" it's redundant with the WARN_ONCE().

-- Steve

> +			       "corrupted preempt_count: %s/%d/0x%x\n",
> +			       current->comm, current->pid, preempt_count())))
> +		preempt_count_set(FORK_PREEMPT_COUNT);
>  
>  	rq->prev_mm = NULL;
>  
> 

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