linux-kernel - Re: [PATCH] ARM: nommu: access ID

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Date:   Thu, 23 Mar 2017 21:37:48 +1000
From:   Greg Ungerer <gerg@...inux.org>
To:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Vladimir Murzin <vladimir.murzin@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: nommu: access ID_PFR1 only if CPUID scheme

Hi Afzal,

On 23/03/17 20:43, afzal mohammed wrote:
> On Fri, Mar 17, 2017 at 10:10:34PM +0530, afzal mohammed wrote:
>> Greg upon trying to boot no-MMU Kernel on ARM926EJ reported boot
>> failure. He root caused it to ID_PFR1 access introduced by the
>> commit mentioned in the fixes tag below.
>>
>> All CP15 processors need not have processor feature registers, only
>> for architectures defined by CPUID scheme would have it. Hence check
>> for it before accessing processor feature register, ID_PFR1.
>>
>> Fixes: f8300a0b5de0 ("ARM: 8647/2: nommu: dynamic exception base address setting")
>> Reported-by: Greg Ungerer <gerg@...inux.org>
>> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
>
> Greg, can i add your Tested-by ?

Absolutely:

Tested-by: Greg Ungerer <gerg@...inux.org>

Thanks for taking care of this.

Regards
Greg


>> ---
>>
>> Hi Russell,
>>
>> It would be good to have the fix go in during -rc, as,
>>
>> 1. Culprit commit went in during the last merge window
>> 2. Though nothing supported in mainline is known to be broken, the
>>     original change needs to be modified to be reliable
>