linux-kernel - Re: T400 suspend/resume regression -- bisected to a mystery merge commit

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Message-ID: <aec7e5c30910012350g3908b2ecj4e9ed5f4549c6a4d@mail.gmail.com>
Date:	Fri, 2 Oct 2009 15:50:43 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Theodore Tso <tytso@....edu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Ondrej Zary <linux@...nbow-software.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: T400 suspend/resume regression -- bisected to a mystery merge 
	commit

On Mon, Sep 28, 2009 at 10:51 PM, Theodore Tso <tytso@....edu> wrote:
> On Sun, Sep 27, 2009 at 06:13:42PM +0200, Rafael J. Wysocki wrote:
>>
>> commit c7121843685de2bf7f3afd3ae1d6a146010bf1fc
>> Author: Magnus Damm <magnus.damm@...il.com>
>> Date:   Tue Jul 28 14:09:55 2009 -0700
>>
>>     clocksource: Save mult_orig in clocksource_disable()
>>
>> Please try to revert it and retest.
>
> Using Linus's suggested technique, I bisected it down to this commit:
>
> Author: Martin Schwidefsky <schwidefsky@...ibm.com>
> Date:   Fri Aug 14 15:47:30 2009 +0200
>
>    timekeeping: Update clocksource with stop_machine
>
>    update_wall_time calls change_clocksource HZ times per second to check
>    if a new clock source is available. In close to 100% of all calls
>    there is no new clock. Replace the tick based check by an update done
>    with stop_machine.
>
>    Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
>    Cc: Ingo Molnar <mingo@...e.hu>
>    Acked-by: John Stultz <johnstul@...ibm.com>
>    Cc: Daniel Walker <dwalker@...o99.com>
>    LKML-Reference: <20090814134810.711836357@...ibm.com>
>    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>
> Unfortunately there are a bunch of patches I'm trying to get in shape
> to push to Linus (the merge window coincided unfortunately with
> LinuxCon/Plumbeer's so I'm a bit behind) so I haven't had a chance to
> take it further.  I'll try reverting each of the above two patches,
> and report back in a day or two.

Just checking, did need to revert
c7121843685de2bf7f3afd3ae1d6a146010bf1fc? I hope not. =)

/ magnus
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