linux-kernel - Re: sched: WARNING: at include/linux/cpumask.h:108 select_fallback

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Date:	Fri, 30 Mar 2012 16:45:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Sasha Levin <levinsasha928@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, mingo@...nel.org,
	"Liu, Chuansheng" <chuansheng.liu@...el.com>, vapier@...too.org,
	rusty@...tcorp.com.au
Subject: Re: sched: WARNING: at include/linux/cpumask.h:108
 select_fallback_rq+0x241/0x280()

On Fri, 2012-03-30 at 19:40 +0530, Srivatsa S. Bhat wrote:

> From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> Subject: sched: Fix incorrect usage of for_each_cpu_mask() in select_fallback_rq()
> 
> The function for_each_cpu_mask() expects a *pointer* to struct cpumask
> as its second argument, whereas select_fallback_rq() passes the value
> itself. And moreover, for_each_cpu_mask() has been marked as obselete
> in include/linux/cpumask.h. So move to the more appropriate for_each_cpu()
> variant.

Gah.. so why did it compile to begin with!?

> Reported-by: Sasha Levin <levinsasha928@...il.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> ---
> 
>  kernel/sched/core.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index e3ed0ec..e85046d 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1270,7 +1270,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
>  	int dest_cpu;
>  
>  	/* Look for allowed, online CPU in same node. */
> -	for_each_cpu_mask(dest_cpu, *nodemask) {
> +	for_each_cpu(dest_cpu, nodemask) {
>  		if (!cpu_online(dest_cpu))
>  			continue;
>  		if (!cpu_active(dest_cpu))
> @@ -1281,7 +1281,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
>  
>  	for (;;) {
>  		/* Any allowed, online CPU? */
> -		for_each_cpu_mask(dest_cpu, *tsk_cpus_allowed(p)) {
> +		for_each_cpu(dest_cpu, tsk_cpus_allowed(p)) {
>  			if (!cpu_online(dest_cpu))
>  				continue;
>  			if (!cpu_active(dest_cpu))
> 
> 



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