netdev - Re: [PATCH] bpf: Fix build in minimal configurations, again

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Message-ID: <20191211130032.GB23015@linux.fritz.box>
Date:   Wed, 11 Dec 2019 14:00:32 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: Fix build in minimal configurations, again

On Tue, Dec 10, 2019 at 09:35:46PM +0100, Arnd Bergmann wrote:
> Building with -Werror showed another failure:
> 
> kernel/bpf/btf.c: In function 'btf_get_prog_ctx_type.isra.31':
> kernel/bpf/btf.c:3508:63: error: array subscript 0 is above array bounds of 'u8[0]' {aka 'unsigned char[0]'} [-Werror=array-bounds]
>   ctx_type = btf_type_member(conv_struct) + bpf_ctx_convert_map[prog_type] * 2;
> 
> I don't actually understand why the array is empty, but a similar
> fix has addressed a related problem, so I suppose we can do the
> same thing here.
> 
> Fixes: ce27709b8162 ("bpf: Fix build in minimal configurations")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied, thanks!