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Message-ID: <1384966640.1403.421.camel@snotra.buserror.net>
Subject: Re: BUG: Patch "Convert some mftb/mftbu into mfspr" breaks MPC885
From: Scott Wood <scottwood@freescale.com>
To: leroy christophe <christophe.leroy@c-s.fr>
CC: LinuxPPC-dev <linuxppc-dev@lists.ozlabs.org>,
        <linux-kernel@vger.kernel.org>,
        Joakim Tjernlund <joakim.tjernlund@transmode.se>
Date: Wed, 20 Nov 2013 10:57:20 -0600
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References: <528C82D1.4090803@c-s.fr>
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On Wed, 2013-11-20 at 10:37 +0100, leroy christophe wrote:
> Scott,
> 
> The patch "Convert some mftb/mftbu into
> mfspr" (beb2dc0a7a84be003ce54e98b95d65cc66e6e536) breaks startup on
> MPC885.
> 
> The CPU traps (SoftwareEmulation trap) at sched_clock() when trying to
> read TBU with mfspr.
> 
> Reverting the patch solves the issue.
> 
> What's the prefered way to fix this ?

I guess we need to add an ifdef.

-Scott