linux-kernel - Re: [PATCH] libbpf: fix readelf output parsing on powerpc with recent binutils

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Message-ID: <20191202093752.GA1535@localhost.localdomain>
Date:   Mon, 2 Dec 2019 10:37:52 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Aurelien Jarno <aurelien@...el32.net>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        debian-kernel@...ts.debian.org,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>
Subject: Re: [PATCH] libbpf: fix readelf output parsing on powerpc with
 recent binutils

On Mon, Dec 02, 2019 at 04:53:26PM +1100, Michael Ellerman wrote:
> Aurelien Jarno <aurelien@...el32.net> writes:
> > On powerpc with recent versions of binutils, readelf outputs an extra
> > field when dumping the symbols of an object file. For example:
> >
> >     35: 0000000000000838    96 FUNC    LOCAL  DEFAULT [<localentry>: 8]     1 btf_is_struct
> >
> > The extra "[<localentry>: 8]" prevents the GLOBAL_SYM_COUNT variable to
> > be computed correctly and causes the checkabi target to fail.
> >
> > Fix that by looking for the symbol name in the last field instead of the
> > 8th one. This way it should also cope with future extra fields.
> >
> > Signed-off-by: Aurelien Jarno <aurelien@...el32.net>
> > ---
> >  tools/lib/bpf/Makefile | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Thanks for fixing that, it's been on my very long list of test failures
> for a while.
> 
> Tested-by: Michael Ellerman <mpe@...erman.id.au>

Looks good & also continues to work on x86. Applied, thanks!