linux-kernel - Re: Linux 5.19-rc6

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Date:   Wed, 13 Jul 2022 15:53:21 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        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 3:42 PM Linus Torvalds
<torvalds@...ux-foundation.org> 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.

Does this patch fix it?
https://patchwork.freedesktop.org/patch/493799/

Alex

>
> 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
>
> > OF: amba_device_add() failed (-19) for /amba/smc@...00000
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 1 at lib/refcount.c:28 of_platform_bus_create+0x33c/0x3dc
> > refcount_t: underflow; use-after-free.
>
> This too has been going on since -rc1, but it's not obvious what caused it.
>
> At a guess, looking around the amba changes, I'm assuming it's
>
>   7719a68b2fa4 ("ARM: 9192/1: amba: fix memory leak in amba_device_try_add()")
>
> Does reverting that commit make it go away?
>
>                     Linus