From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm <linux-mm@kvack.org>
Subject: Re: [patch]mm: fix a vmscan warning
Date: Mon, 1 Aug 2011 15:48:27 +0900 [thread overview]
Message-ID: <20110801154827.9b56c752.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <1312180877.15392.426.camel@sli10-conroe>
On Mon, 01 Aug 2011 14:41:17 +0800
Shaohua Li <shaohua.li@intel.com> wrote:
> I get below warnning:
> BUG: using smp_processor_id() in preemptible [00000000] code: bash/746
> caller is native_sched_clock+0x37/0x6e
> Pid: 746, comm: bash Tainted: G W 3.0.0+ #254
> Call Trace:
> [<ffffffff813435c6>] debug_smp_processor_id+0xc2/0xdc
> [<ffffffff8104158d>] native_sched_clock+0x37/0x6e
> [<ffffffff81116219>] try_to_free_mem_cgroup_pages+0x7d/0x270
> [<ffffffff8114f1f8>] mem_cgroup_force_empty+0x24b/0x27a
> [<ffffffff8114ff21>] ? sys_close+0x38/0x138
> [<ffffffff8114ff21>] ? sys_close+0x38/0x138
> [<ffffffff8114f257>] mem_cgroup_force_empty_write+0x17/0x19
> [<ffffffff810c72fb>] cgroup_file_write+0xa8/0xba
> [<ffffffff811522d2>] vfs_write+0xb3/0x138
> [<ffffffff8115241a>] sys_write+0x4a/0x71
> [<ffffffff8114ffd9>] ? sys_close+0xf0/0x138
> [<ffffffff8176deab>] system_call_fastpath+0x16/0x1b
>
> sched_clock() can't be used with preempt enabled. And we don't
> need fast approach to get clock here, so let's use ktime API.
>
> Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Tested, thanks!.
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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prev parent reply other threads:[~2011-08-01 6:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-01 6:41 Shaohua Li
2011-08-01 6:48 ` KAMEZAWA Hiroyuki [this message]
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