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Subject: Re: [PATCH bpf-next] btf: do not use CONFIG_OUTPUT_FORMAT
To:     Ilya Leoshkevich <iii@linux.ibm.com>,
        Alexei Starovoitov <ast@kernel.org>
Cc:     bpf@vger.kernel.org, Andrii Nakryiko <andrii.nakryiko@gmail.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>
References: <20190820112939.84249-1-iii@linux.ibm.com>
From:   Daniel Borkmann <daniel@iogearbox.net>
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Date:   Wed, 21 Aug 2019 17:22:18 +0200
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On 8/20/19 1:29 PM, Ilya Leoshkevich wrote:
> Building s390 kernel with CONFIG_DEBUG_INFO_BTF fails, because
> CONFIG_OUTPUT_FORMAT is not defined. As a matter of fact, this variable
> appears to be x86-only, so other arches might be affected as well.
> 
> Fix by obtaining this value from objdump output, just like it's already
> done for bin_arch. The exact objdump invocation is "inspired" by
> arch/powerpc/boot/wrapper.
> 
> Also, use LANG=C for the existing bin_arch objdump invocation to avoid
> potential build issues on systems with non-English locale.
> 
> Fixes: 341dfcf8d78e ("btf: expose BTF info through sysfs")
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>

LGTM, applied, thanks!