linux-kernel - Re: Linux 5.19-rc6

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Date:   Wed, 13 Jul 2022 17:00:58 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     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>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: Linux 5.19-rc6

On Wed, Jul 13, 2022 at 4:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> 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.

If you want to apply Guenter's patch original patch:
https://patchwork.freedesktop.org/patch/490184/
That's fine with me.  It just kind of slipped off my radar.  We can
dig deeper on a better fix next cycle.
Acked-by: Alex Deucher <alexander.deucher@....com>

>
> Guenter