linux-kernel - Re: [BUG] Code reordering in swsusp breaks suspend on SMP systems

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Message-Id: <20070321233159.0f851bdd.akpm@linux-foundation.org>
Date:	Wed, 21 Mar 2007 23:31:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Chinner <dgc@....com>, nigel@...el.suspend2.net,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>
Subject: Re: [BUG] Code reordering in swsusp breaks suspend on SMP systems

On Thu, 22 Mar 2007 08:23:39 +0100 "Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Thursday, 22 March 2007 05:51, David Chinner wrote:
> > On Wed, Mar 21, 2007 at 10:38:33PM +0100, Rafael J. Wysocki wrote:
> > > 
> > > I think this is the XFS problem with freezable workqueues.
> > > 
> > > Maxim, please try to apply the appended patch and see if it helps.
> > > 
> > > Greetings,
> > > Rafael
> > > 
> > > 
> > > ---
> > > Since freezable workqueues are broken in 2.6.21-rc
> > > (cf. http://marc.theaimsgroup.com/?l=linux-kernel&m=116855740612755,
> > > http://marc.theaimsgroup.com/?l=linux-kernel&m=117261312523921&w=2)
> > > it's better to remove them altogether for 2.6.21 and change the only user of
> > > them (XFS) accordingly.
> > > 
> > > ---
> > >  fs/xfs/linux-2.6/xfs_buf.c |    4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > Index: linux-2.6.21-rc4/fs/xfs/linux-2.6/xfs_buf.c
> > > ===================================================================
> > > --- linux-2.6.21-rc4.orig/fs/xfs/linux-2.6/xfs_buf.c
> > > +++ linux-2.6.21-rc4/fs/xfs/linux-2.6/xfs_buf.c
> > > @@ -1829,11 +1829,11 @@ xfs_buf_init(void)
> > >  	if (!xfs_buf_zone)
> > >  		goto out_free_trace_buf;
> > >  
> > > -	xfslogd_workqueue = create_freezeable_workqueue("xfslogd");
> > > +	xfslogd_workqueue = create_workqueue("xfslogd");
> > >  	if (!xfslogd_workqueue)
> > >  		goto out_free_buf_zone;
> > >  
> > > -	xfsdatad_workqueue = create_freezeable_workqueue("xfsdatad");
> > > +	xfsdatad_workqueue = create_workqueue("xfsdatad");
> > >  	if (!xfsdatad_workqueue)
> > >  		goto out_destroy_xfslogd_workqueue;
> > >  
> > 
> > Acked-by: Dave Chinner <dgc@....com>
> > 
> > Rafael, it sounds like this really needs to go into the next -rc
> > kernel. Can you push it to Linus?
> 
> I tried, but Andrew resent it to you. :-)
> 
> Andrew, could we please merge it?

Sure.

It shouldn't be this hard :(
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