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

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Date:	Mon, 28 Sep 2009 09:51:09 -0400
From:	Theodore Tso <tytso@....edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	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 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.

    	   	   				- Ted
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