linux-kernel - Re: Regression for Power PC in 4.14-rc0

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Date:   Thu, 14 Sep 2017 10:37:24 +1000
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...abs.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Regression for Power PC in 4.14-rc0 - bisected to commit
 31bfdb036f12

On 14/09/17 10:07, Larry Finger wrote:
> When booting my PowerBook Aluminum G4, I get a pop-up screen that says 
> "The system is running in low-graphics  mode. Your screen, graphics 
> card, and input device settings could not be detected correctly. You 
> will need to configure these yourself." This is a big-endian 74xx CPU. 
> The lscpu command says it is a PowerBook5,6 model.
> 
> This problem has been bisected to commit 31bfdb036f12 ("powerpc: Use 
> instruction emulation infrastructure to handle alignment faults"). I am 
> confident of the accuracy of the bisection.
> 
> Attached is the configuration.

Try with https://patchwork.ozlabs.org/patch/813153/

(A selftest for the instruction emulation will make its way upstream 
eventually...)

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited