linux-kernel - Re: [3/5] 2.6.21-rc4: known regressions (v2)

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Date:	Sun, 25 Mar 2007 21:31:14 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Meyer <thomas@...3r.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tony Luck <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [3/5] 2.6.21-rc4: known regressions (v2)

On Sunday, 25 March 2007 21:06, Rafael J. Wysocki wrote:
> On Sunday, 25 March 2007 19:25, Thomas Meyer wrote:
> > Adrian Bunk schrieb:
> > > On Sun, Mar 25, 2007 at 01:41:33PM +0200, Thomas Meyer wrote:
> > >   
> > >> ...
> > >> The first suspend to disk is ok. The second suspend to disk has a
> > >> strange behaviour:
> > >> 1.) write pm image
> > >> 2.) the system disable the non-boot cpus again (i guess this happens in
> > >> power_down())
> > >> 3.) the system doesn't power down.
> > >> 4.) pressing any key and the system powers down.
> > >> ...
> > >>     
> > >
> > > Is this also present with 2.6.20, or is it a regression?
> > >   
> > No, this one is not present in 2.6.20 and this error doesn't (head=
> > 317ec6cd00f25d05d153a780bc178c5335f320ee) occur with NO_HZ=n and
> > HIGH_RES_TIMERS=n
> > 
> > This error is maybe related with this commit:
> 
> Yes, it is, but I'd rather remove the disable_nonboot_cpus() from
> power_down() (as Eric suggested) instead of trying to handle the RCU sync
> problem here.
> 
> This has been caused by my commit 94985134b7b46848267ed6b734320db01c974e72
> (swsusp: disable nonboot CPUs before entering platform suspend) that in such a
> case should be reverted.

s/such a case/the present situation/

Rafael
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