linux-kernel - Re: [patch] export percpu cpuacct cgroup stats

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Message-ID: <4938E7C1.9040102@cn.fujitsu.com>
Date:	Fri, 05 Dec 2008 16:35:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ken Chen <kenchen@...gle.com>
CC:	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch] export percpu cpuacct cgroup stats

Ken Chen wrote:
> On Thu, Dec 4, 2008 at 11:54 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>>> +             seq_printf(m, "%llu ", percpu);
>> Should be:
>> +               seq_printf(m, "%llu ", (unsigned long long)percpu);
>>
>> Otherwsise:
>> kernel/sched.c: In function 'cpuacct_percpu_seq_read':
>> kernel/sched.c:9359: warning: format '%llu' expects type 'long long unsigned int',
>> but argument 3 has type 'u64'
> 
> huh, I was just wondering about the type case in cgroup_read_u64()
> when I was looking at it earlier.  That explains it.  Diff patch
> attached.
> 

Reviewed-by: Li Zefan <lizf@...fujitsu.com>

> diff --git a/kernel/sched.c b/kernel/sched.c
> index e32c094..055c54f 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -9356,7 +9356,7 @@ static int cpuacct_percpu_seq_read
>  		spin_lock_irq(&cpu_rq(i)->lock);
>  		percpu = *percpu_ptr(ca->cpuusage, i);
>  		spin_unlock_irq(&cpu_rq(i)->lock);
> -		seq_printf(m, "%llu ", percpu);
> +		seq_printf(m, "%llu ", (unsigned long long) percpu);
>  	}
>  	seq_printf(m, "\n");
>  	return 0;
> 
> 

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