linux-kernel - Re: [-mm] warning during suspend [was: suspend race -mm regression]

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Date:	Sat, 05 Sep 2009 22:41:37 +0800
From:	Xiao Guangrong <ericxiao.gr@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Nick Piggin <npiggin@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [-mm] warning during suspend [was: suspend race -mm regression]

Jiri Slaby 写道:
> On 09/05/2009 12:36 AM, Jiri Slaby wrote:
>> On 09/05/2009 12:30 AM, Jiri Slaby wrote:
>>> WARNING: at kernel/smp.c:124
>>> __generic_smp_call_function_interrupt+0xfd/0x110()
>>> Hardware name: To Be Filled By O.E.M.
>>> Modules linked in: nfs lockd auth_rpcgss sunrpc ath5k ath
>>> Pid: 3423, comm: pm-suspend Not tainted 2.6.31-rc8-mm1_64 #762
>>> Call Trace:
>>>  [<ffffffff8103fc48>] warn_slowpath_common+0x78/0xb0
>>>  [<ffffffff8103fc8f>] warn_slowpath_null+0xf/0x20
>>>  [<ffffffff8106950d>] __generic_smp_call_function_interrupt+0xfd/0x110
>>>  [<ffffffff8106956a>] hotplug_cfd+0x4a/0xa0
>>>  [<ffffffff81434e47>] notifier_call_chain+0x47/0x90
>>>  [<ffffffff8105b311>] raw_notifier_call_chain+0x11/0x20
>>>  [<ffffffff8141ece0>] _cpu_down+0x150/0x2d0
>> It's the CPU_DEAD notifier:
>> ffffffff8141ecd0:       48 83 ce 07             or     $0x7,%rsi
>> ffffffff8141ecd4:       48 c7 c7 08 ff 5d 81    mov
>> $0xffffffff815dff08,%rdi
>> ffffffff8141ecdb:       e8 20 c6 c3 ff          callq  ffffffff8105b300
>> <raw_notifier_call_chain>
>> ffffffff8141ece0:       3d 02 80 00 00          cmp    $0x8002,%eax
> 
> And it's due to:
> generic-ipi-fix-the-race-between-generic_smp_call_function_-and-hotplug_cfd.patch
> 

I think it has collision between my patch and below patch:

Commit-ID:  269c861baa2fe7c114c3bc7831292758d29eb336
Gitweb:     http://git.kernel.org/tip/269c861baa2fe7c114c3bc7831292758d29eb336
Author:     Suresh Siddha <suresh.b.siddha@...el.com>
AuthorDate: Wed, 19 Aug 2009 18:05:35 -0700
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Fri, 21 Aug 2009 16:25:43 -0700

generic-ipi: Allow cpus not yet online to call smp_call_function with irqs disabled

My patch is merged at -mm tree, but this patch is base on -tip tree later, so it has this
problem

Suresh, what your opinion?

Thanks,
Xiao

> Should the WARN_ONs now warn only when run_callbacks is true?
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