linux-kernel - Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get

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Date:   Tue, 7 Jul 2020 21:02:58 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, npiggin@...il.com,
        segher@...nel.crashing.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with
 __put_user()/__get_user()



Le 07/07/2020 à 14:44, Christophe Leroy a écrit :
> 
> 
> Le 30/06/2020 à 03:19, Michael Ellerman a écrit :
>> Michael Ellerman <mpe@...erman.id.au> writes:
>>> Christophe Leroy <christophe.leroy@...roup.eu> writes:
>>>> Hi Michael,
>>>>
>>>> I see this patch is marked as "defered" in patchwork, but I can't see
>>>> any related discussion. Is it normal ?
>>>
>>> Because it uses the "m<>" constraint which didn't work on GCC 4.6.
>>>
>>> https://github.com/linuxppc/issues/issues/297
>>>
>>> So we should be able to pick it up for v5.9 hopefully.
>>
>> It seems to break the build with the kernel.org 4.9.4 compiler and
>> corenet64_smp_defconfig:
> 
> Most likely a GCC bug ?
> 
> It seems the problem vanishes with patch 
> https://patchwork.ozlabs.org/project/linuxppc-dev/patch/173de3b659fa3a5f126a0eb170522cccd909950f.1594125164.git.christophe.leroy@csgroup.eu/ 
> 

Same kind of issue in signal_64.c now.

The following patch fixes it: 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/810bd8840ef990a200f58c9dea9abe767ca02a3a.1594146723.git.christophe.leroy@csgroup.eu/

Christophe