linux-kernel - Re: Linux 5.19-rc6

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Message-ID: <a804b76e-159f-dbc2-f8dc-62a58552e88d@roeck-us.net>
Date:   Wed, 13 Jul 2022 13:46:17 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Balbir Singh <bsingharora@...il.com>,
        Daniel Axtens <dja@...ens.net>,
        Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: Linux 5.19-rc6

On 7/13/22 12:36, Linus Torvalds wrote:
> On Tue, Jul 12, 2022 at 10:07 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> Same problems as every week.
>>
>> Building powerpc:allmodconfig ... failed
> 
> Ok, this has been going on since -rc1, which is much too long.
> 
>>>From your patch submission that that was rejected:
> 
>> The problem was introduced with commit 41b7a347bf14 ("powerpc: Book3S
>> 64-bit outline-only KASAN support") which adds support for KASAN. This
>> commit in turn enables DRM_AMD_DC_DCN because KCOV_INSTRUMENT_ALL and
>> KCOV_ENABLE_COMPARISONS are no longer enabled. As result, new files are
>> compiled which lack the selection of hard-float.
> 
> And considering that neither the ppc people nor the drm people seem
> interested in fixing this, and it doesn't revert cleanly I think the
> sane solution seems to be to just remove PPC64 support for DRM_AMD_DC
> entirely.
> 
> IOW, does something like this (obviously nor a proper patch, but you
> get the idea) fix the ppc build for you?
> 
>    @@ -6,7 +6,7 @@ config DRM_AMD_DC
>            bool "AMD DC - Enable new display engine"
>            default y
>            select SND_HDA_COMPONENT if SND_HDA_CORE
>    -       select DRM_AMD_DC_DCN if (X86 || PPC64) &&
> !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS)
>    +       select DRM_AMD_DC_DCN if X86 && !(KCOV_INSTRUMENT_ALL &&
> KCOV_ENABLE_COMPARISONS)
>            help
>              Choose this option if you want to use the new display engine
>              support for AMDGPU. This adds required support for Vega and
> 

It does, but I can't imagine that the drm or ppc people would be happy
about it.

Guenter