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Date: Mon, 12 Nov 2001 18:10:52 +0100
From: Thorsten Kukuk <kukuk@suse.de>
To: Andrea Arcangeli <andrea@suse.de>
Cc: "David S. Miller" <davem@redhat.com>, mathijs@knoware.nl,
        jgarzik@mandrakesoft.com, linux-kernel@vger.kernel.org,
        torvalds@transmeta.com, kuznet@ms2.inr.ac.ru
Subject: Re: [PATCH] fix loop with disabled tasklets
Message-ID: <20011112181052.A23397@suse.de>
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In-Reply-To: <20011112152044.V1381@athlon.random>; from andrea@suse.de on Mon, Nov 12, 2001 at 03:20:44PM +0100
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On Mon, Nov 12, Andrea Arcangeli wrote:

> On Mon, Nov 12, 2001 at 03:04:52PM +0100, Andrea Arcangeli wrote:
> > On Mon, Nov 12, 2001 at 12:03:05AM -0800, David S. Miller wrote:
> > >    From: Andrea Arcangeli <andrea@suse.de>
> > >    Date: Mon, 12 Nov 2001 02:11:42 +0100
> > > 
> > >    I'm just guessing: the scheduler isn't yet functional when
> > >    spawn_ksoftirqd is called.
> > > 
> > > The scheduler is fully functional, this isn't what is going wrong.
> > 
> > check ret_from_fork path, sparc32 scheduler is broken and this is why it
> > deadlocks at boot, it has nothing to do with the softirq code, softirq
> > code is innocent and it only get bitten by the sparc32 bug.
> 
> real fix looks like this (no idea what PSR_PIL means so not sure if this
> really works on UP but certainly the sched_yield breakage is fixed now
> and it won't deadlock in the softirq code any longer):

A kernel with Andrea patch boots (after renaming all remaining
ret_from_smpfork to ret_from_fork) on one critical machine from me.
I will test the other this evening.

  Thorsten

-- 
Thorsten Kukuk       http://www.suse.de/~kukuk/        kukuk@suse.de
SuSE GmbH            Deutschherrenstr. 15-19       D-90429 Nuernberg
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