linux-kernel - Re: linux-next: build failure after merge of the bpf-next tree

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Date:   Tue, 14 Jul 2020 11:19:47 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: linux-next: build failure after merge of the bpf-next tree

Hi Jiri,

On Tue, Jul 14, 2020 at 10:33 AM Jiri Olsa <jolsa@...hat.com> wrote:
> On Tue, Jul 14, 2020 at 08:16:54AM +0200, Jiri Olsa wrote:
> > On Tue, Jul 14, 2020 at 12:22:47PM +1000, Stephen Rothwell wrote:
> > > After merging the bpf-next tree, today's linux-next build (arm
> > > multi_v7_defconfig) failed like this:
> > >
> > > tmp/ccsqpVCY.s: Assembler messages:
> > > tmp/ccsqpVCY.s:78: Error: unrecognized symbol type ""
> > > tmp/ccsqpVCY.s:91: Error: unrecognized symbol type ""
> > >
> > > I don't know what has caused this (I guess maybe the resolve_btfids
> > > branch).
> > >
> > > I have used the bpf-next tree from next-20200713 for today.

Bummer, didn't find this report before I had bisected this to
c9a0f3b85e09dd16 ("bpf: Resolve BTF IDs in vmlinux image"), and
investigated the root cause (@object) myself, as the failing file path
(net/core/filter.o) was not mentioned...

> > ok, trying to reproduce
>
> damn crossbuilds.. change below fixes it for me,
> will do some more testing and post it today

Thanks, this fixes my (cross)arm32 build, and the (cross)arm64 build
keeps working, and everything boots, so
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds