linux-kernel - Re: [4/5] 2.6.21-rc5: known regressions

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Message-ID: <20070327222919.GI16477@stusta.de>
Date:	Wed, 28 Mar 2007 00:29:19 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, Thomas Meyer <thomas@...3r.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [4/5] 2.6.21-rc5: known regressions

On Tue, Mar 27, 2007 at 12:09:13PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, 27 March 2007 03:59, Adrian Bunk wrote:
> > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > 
> > If you find your name in the Cc header, you are either submitter of one
> > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > of you caused a breakage or I'm considering you in any other way
> > possibly involved with one or more of these issues.
> > 
> > Due to the huge amount of recipients, please trim the Cc when answering.
> 
> I think the following two:
>  
> > Subject    : suspend to disk: keypress required for power down
> > References : http://lkml.org/lkml/2007/3/25/78
> > Submitter  : Thomas Meyer <thomas@...3r.de>
> > Status     : unknown
>  
> > Subject    : suspend to disk: non-boot cpus are disabled again
> > References : http://lkml.org/lkml/2007/3/25/78
> > Submitter  : Thomas Meyer <thomas@...3r.de>
> > Handled-By : Rafael J. Wysocki <rjw@...k.pl>
> >              Eric W. Biederman <ebiederm@...ssion.com>
> > Status     : problem is being debugged
> 
> are related to the same issue.
> 
> The problem is that we call disable_nonboot_cpus() in swsusp before
> powering down the system in order to avoid triggering the WARN_ON()
> in arch/x86_64/kernel/acpi/sleep.c:init_low_mapping() and this doesn't
> work well on Thomas' system.
> 
> Since the problem has been introduced by commit
> 94985134b7b46848267ed6b734320db01c974e72
> (swsusp: disable nonboot CPUs before entering platform suspend), I think it's
> better to revert this commit and remove the the WARN_ON() in
> arch/x86_64/kernel/acpi/sleep.c:init_low_mapping() (appended is a patch that
> removes the WARN_ON()).

It's now in Linus' tree.

Thomas (Meyer), are there any regressions left with the latest -git tree 
plus the MSI fix?

> Greetings,
> Rafael
>...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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