linux-kernel - Re: Seems like "sched: Add missing call to calc_load_exit

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Date:	Mon, 08 Oct 2012 19:23:28 +0800
From:	Charles Wang <0oo0.hust@...il.com>
To:	Jonathan Nieder <jrnieder@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Huacai Chen <chenhc@...ote.com>,
	Charles Wang <muming.wq@...bao.com>,
	Ingo Molnar <mingo@...nel.org>, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Seems like "sched: Add missing call to calc_load_exit_idle()"
 should be reverted in 3.5 branch

On 10/05/2012 09:39 AM, Jonathan Nieder wrote:
> Peter Zijlstra wrote:
>
>> I can't find wtf went wrong either, the initial patch 5167e8d5417bf5c
>> contains both hunks, but in that case the fixup 749c8814f0 doesn't make
>> sense, not can I find anything in merge commits using:
>>
>>    git log -S calc_load_exit_idle kernel/time/tick-sched.c
>
>   git log -m -p --first-parent -Scalc_load_exit_idle -- kernel/time/tick-sched.c
>
> finds 3992c0321258 ("Merge branch 'timers-core-for-linus'",
> 2012-07-22), which seems to have mismerged 2ac0d98fd624 ("nohz: Make
> nohz API agnostic against idle ticks cputime accounting").
That's it.  Patch 2ac0d98fd624 and 19f5f7364("nohz: Separate idle 
sleeping time accounting from nohz logic") are produced on 2011-07-28, 
merged on 2012-07-22, right after 5167e8d5417bf5c, but applied before 
5167e8d5417bf5c.
These two patches changed tick_nohz_idle_exit, which causing Peter's 
patch 5167e8d5417bf5c couldn't fully be applied.
There should be conflict being reported, but why we don't get is really 
confused.
>
> Thanks,
> Jonathan
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