linux-kernel - Re: [PATCH] compiler-clang: remove version check for BPF Tracing

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Message-ID: <20201105005613.GA1840301@ubuntu-m3-large-x86>
Date:   Wed, 4 Nov 2020 17:56:13 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, stable@...r.kernel.org,
        Chen Yu <yu.chen.surf@...il.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Marco Elver <elver@...gle.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] compiler-clang: remove version check for BPF Tracing

On Wed, Nov 04, 2020 at 11:10:51AM -0800, Nick Desaulniers wrote:
> bpftrace parses the kernel headers and uses Clang under the hood. Remove
> the version check when __BPF_TRACING__ is defined (as bpftrace does) so
> that this tool can continue to parse kernel headers, even with older
> clang sources.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: commit 1f7a44f63e6c ("compiler-clang: add build check for clang 10.0.1")
> Reported-by: Chen Yu <yu.chen.surf@...il.com>
> Reported-by: Jarkko Sakkinen <jarkko@...nel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Acked-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  include/linux/compiler-clang.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> index dd7233c48bf3..98cff1b4b088 100644
> --- a/include/linux/compiler-clang.h
> +++ b/include/linux/compiler-clang.h
> @@ -8,8 +8,10 @@
>  		     + __clang_patchlevel__)
>  
>  #if CLANG_VERSION < 100001
> +#ifndef __BPF_TRACING__
>  # error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
>  #endif
> +#endif
>  
>  /* Compiler specific definitions for Clang compiler */
>  
> -- 
> 2.29.1.341.ge80a0c044ae-goog
>