linux-kernel - Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <1183504112.3388.45.camel@localhost.localdomain>
Date:	Wed, 04 Jul 2007 09:08:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, rjw@...k.pl,
	mjg59@...f.ucam.org, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, pavel@....cz,
	nigel@...el.suspend2.net
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway

On Wed, 2007-07-04 at 00:04 +0200, Oliver Neukum wrote:
> Am Dienstag, 3. Juli 2007 schrieb Benjamin Herrenschmidt:
> > On Tue, 2007-07-03 at 23:48 +0200, Oliver Neukum wrote:
> > > Am Dienstag, 3. Juli 2007 schrieb Benjamin Herrenschmidt:
> > > > On Tue, 2007-07-03 at 21:32 +0200, Oliver Neukum wrote:
> > > > > > I'm not sure why this can't be made atomic, but assuming, that it
> > > > > > can't, fuse should still not need to be implicated.  If it is,
> > > > > that's
> > > > > > an indication about something wrong in the suspend procedure.
> > > > > 
> > > > > Nope, something's wrong in fuse. You must be able to deal with sync
> > > > > until every task is frozen. 
> > > > 
> > > > Pipe dream
> > > 
> > > Then tell me how you want to avoid that condition.
> > 
> > Don't freeze :-)
> 
> Then you will have to deal with all syscalls unfrozen tasks can make.

Yup, and the majority of them is totally harmless. Looks like people
around here have a problem with the idea of writing robust drivers ...

Ben.

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