[PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user()

[Christophe Leroy]

Le 30/06/2020 à 03:19, Michael Ellerman a écrit :
> Michael Ellerman <mpe at ellerman.id.au> writes:
>> Christophe Leroy <christophe.leroy at csgroup.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/ 


Christophe