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Re: SMP MIPS and Linux 3.2

To: Mikael Starvik <mikael.starvik@axis.com>
Subject: Re: SMP MIPS and Linux 3.2
From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 21 Feb 2012 11:34:55 +0100
Cc: "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
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On Mon, Feb 20, 2012 at 10:34:20AM +0100, Mikael Starvik wrote:

> I'm running Linux 3.2 on a MIPS 34K with two VPEs (in MT_SMP configuration). 
> It works fine in UP but with SMP it deadlocks during bootup (both CPUs gets 
> idle). Typically like this:
> 
> [    0.090000] CPU revision is: 01019550 (MIPS 34Kc)
> [    0.090000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
> [    0.090000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 
> bytes
> [    0.170000] Brought up 2 CPUs
> <No more output>
> 
> I have tried to enable __ARCH_WANT_INTERRUPTS_ON_CTXSW but that didn't
> improve anything. Anyone else got this running or have any thoughts about
> what the problem may be?

It used to work ...  Are you testing this on Malta?  In my experience if a
CPU hangs at this stage it often is because it does not receive a timer
tick, so all changes to the timer code are candidates to be reviewed.
Git bisect may be the way of least resistance here.  

  Ralf

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