linux-kernel - Re: cpu_init is called during resume

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Message-ID: <20060831223121.GG12847@elf.ucw.cz>
Date:	Fri, 1 Sep 2006 00:31:21 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: cpu_init is called during resume

Hi!

> >cpu_init() is called during resume, at time when GFP_KERNEL is not
> >available. This silences warning, and adds few small cleanups.
> >  
> 
> I presume this is resume from disk.  If you're doing resume from RAM, 
> all the CPU-related stuff should already be allocated, unless you're 
> bringing up a new CPU which wasn't previously there, right?

We are doing virtual cpu hotplug/unplug... actually suspend to RAM
*and* disk. Just try it :-).

> And wouldn't making these allocations atomic make real CPU hotplug (ie, 
> on an active, running system) more likely to fail?  This code doesn't 
> deal with allocation failure very elegantly.

Hmm... well hopefully free_pages_min will cover this case.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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