Re: [PATCH] Fix failure to resume from initrds.

From: Rafael J. Wysocki
Date: Tue Sep 11 2007 - 09:01:23 EST


On Tuesday, 11 September 2007 13:55, Rafael J. Wysocki wrote:
> On Tuesday, 11 September 2007 13:27, Nigel Cunningham wrote:
> > Hi.
> >
> > On Tuesday 11 September 2007 21:04:22 Rafael J. Wysocki wrote:
> > > On Tuesday, 11 September 2007 05:54, Nigel Cunningham wrote:
> > > > Hi all.
> > > >
> > > > Commit 831441862956fffa17b9801db37e6ea1650b0f69 (Freezer: make kernel
> > threads
> > > > nonfreezable by default) breaks freezing when attempting to resume from an
> > > > initrd, because the init (which is freezeable) spins while waiting for
> > another
> > > > thread to run /linuxrc, but doesn't check whether it has been told to
> > enter
> > > > the refrigerator.
> > >
> > > Hm.
> > >
> > > I use a resume from an initrd on a regular basis and it works without the
> > patch
> > > below.
> > >
> > > I think we need to investigate what happens in your test case a bit.
> >
> > Ah. That makes me realise that I see that too - my AMD64 uniprocessor laptop
> > didn't need the patch (guess that's why I didn't notice the need and ack'd
> > the patch). But my x86 SMP machine... it needs this. I'll see if they're
> > running on different processors.
>
> Well, strange. My x86_64 SMP machines don't need the patch too.

Anyway, yes, init is freezable, but should it be?

I mean, shouldn't we rather add PF_NOFREEZE to kernel_init()?

Greetings,
Rafael
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