linux-kernel - Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)

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Message-Id: <200804140027.12161.rjw@sisk.pl>
Date:	Mon, 14 Apr 2008 00:27:11 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	benh@...nel.crashing.org
Cc:	Greg KH <greg@...ah.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>,
	Nigel Cunningham <ncunningham@...a.org.au>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)

On Monday, 14 of April 2008, Benjamin Herrenschmidt wrote:
> 
> > > I don't see the point... On the contrary, prepare() is the pefect place
> > > to implement handshaking with userspace for drivers that need to do so,
> > > such as the DRM.
> > 
> > This _comment_ reflects the current situation, which is that we freeze tasks
> > before a suspend.  When it's no longer necessary to do that, I'll be happy to
> > change this comment.  For now, however, that's not the case.
> 
> Can't we run the freezer after prepare() instead ?

Well, I'm not sure and I'm not going to introduce the change right now, after
the paches have been included in -mm.

That would require quite some changes in the core code that I'd prefer to
avoid for now.  We can do something like this in a separate patch series after
the present one settles down a bit.

Thanks,
Rafael
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