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Date:   Tue, 4 Oct 2022 14:05:58 +1100
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     David Airlie <airlied@redhat.com>
Cc:     broonie@kernel.org, Lucas Stach <l.stach@pengutronix.de>,
        Aurabindo Pillai <aurabindo.pillai@amd.com>,
        Hamza Mahfooz <hamza.mahfooz@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        DRI <dri-devel@lists.freedesktop.org>
Subject: Re: linux-next: build failure after merge of the drm tree
Message-ID: <20221004140558.64f59f2c@canb.auug.org.au>
In-Reply-To: <CAMwc25oshRcJBoCT70B+b42bh5sPqgyoHuBx6K6ZLrwBMHnJzw@mail.gmail.com>
References: <20220930105434.111407-1-broonie@kernel.org>
        <20221004132047.435d42db@canb.auug.org.au>
        <CAMwc25oshRcJBoCT70B+b42bh5sPqgyoHuBx6K6ZLrwBMHnJzw@mail.gmail.com>
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Hi Dave,

On Tue, 4 Oct 2022 12:24:37 +1000 David Airlie <airlied@redhat.com> wrote:
>
> On Tue, Oct 4, 2022 at 12:21 PM Stephen Rothwell <sfr@canb.auug.org.au> w=
rote:
> >
> > On Fri, 30 Sep 2022 11:54:34 +0100 broonie@kernel.org wrote: =20
> > >
> > > After merging the drm tree, today's linux-next build (x86_64
> > > allmodconfig) failed like this:
> > >
> > > /tmp/next/build/drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stre=
am.c: In function 'dc_stream_remove_writeback':
> > > /tmp/next/build/drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stre=
am.c:527:55: error: array subscript [0, 0] is outside array bounds of 'stru=
ct dc_writeback_info[1]' [-Werror=3Darray-bounds]
> > >   527 |     stream->writeback_info[j] =3D stream->writeback_info[i];
> > >       |                                 ~~~~~~~~~~~~~~~~~~~~~~^~~
> > > cc1: all warnings being treated as errors
> > >
> > > Caused by
> > >
> > >     5d8c3e836fc224 ("drm/amd/display: fix array-bounds error in dc_st=
ream_remove_writeback()")
> > >
> > > I have reverted that commit for today. =20
> >
> > I am still getting this failure.  The full error is:
> >
> > drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function =
'dc_stream_remove_writeback':
> > drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:83: error=
: array subscript [0, 0] is outside array bounds of 'struct dc_writeback_in=
fo[1]' [-Werror=3Darray-bounds]
> >   527 |                                 stream->writeback_info[j] =3D s=
tream->writeback_info[i];
> >       |                                                             ~~~=
~~~~~~~~~~~~~~~~~~~^~~
> > In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:126=
9,
> >                  from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core=
_types.h:29,
> >                  from drivers/gpu/drm/amd/amdgpu/../display/dc/basics/d=
c_common.h:29,
> >                  from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_=
stream.c:27:
> > drivers/gpu/drm/amd/amdgpu/../display/dc/dc_stream.h:241:34: note: whil=
e referencing 'writeback_info'
> >   241 |         struct dc_writeback_info writeback_info[MAX_DWB_PIPES];
> >       |                                  ^~~~~~~~~~~~~~ =20
>=20
> I'm not seeing it here, what gcc is this with?

I am using an x86_64 cross compiler hosted on ppc64le - gcc v11.2.0 (on
Debian).

--=20
Cheers,
Stephen Rothwell

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