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Subject: Re: [PATCH v2] bpf: btf: Always output invariant hit in pahole DWARF
 to BTF transform
To:     Chris Down <chris@chrisdown.name>, bpf@vger.kernel.org,
        netdev@vger.kernel.org
Cc:     Stanislav Fomichev <sdf@google.com>,
        Andrii Nakryiko <andriin@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        linux-kernel@vger.kernel.org, kernel-team@fb.com
References: <20200122000110.GA310073@chrisdown.name>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <fcea8bd9-2bea-ddb2-449e-8640e772c487@iogearbox.net>
Date:   Wed, 22 Jan 2020 18:24:01 +0100
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On 1/22/20 1:01 AM, Chris Down wrote:
> When trying to compile with CONFIG_DEBUG_INFO_BTF enabled, I got this
> error:
> 
>      % make -s
>      Failed to generate BTF for vmlinux
>      Try to disable CONFIG_DEBUG_INFO_BTF
>      make[3]: *** [vmlinux] Error 1
> 
> Compiling again without -s shows the true error (that pahole is
> missing), but since this is fatal, we should show the error
> unconditionally on stderr as well, not silence it using the `info`
> function. With this patch:
> 
>      % make -s
>      BTF: .tmp_vmlinux.btf: pahole (pahole) is not available
>      Failed to generate BTF for vmlinux
>      Try to disable CONFIG_DEBUG_INFO_BTF
>      make[3]: *** [vmlinux] Error 1
> 
> Signed-off-by: Chris Down <chris@chrisdown.name>
> Cc: Stanislav Fomichev <sdf@google.com>
> Cc: Andrii Nakryiko <andriin@fb.com>
> Cc: John Fastabend <john.fastabend@gmail.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: bpf@vger.kernel.org
> Cc: kernel-team@fb.com

Applied, thanks!