netdev - Re: [PATCH bpf-next 1/2] bpf: change var type of BTF_ID

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Date:   Fri, 17 Jul 2020 21:21:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Yonghong Song <yhs@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Olsa <jolsa@...nel.org>, kernel-team@...com
Subject: Re: [PATCH bpf-next 1/2] bpf: change var type of BTF_ID_LIST to
 static

On Fri, Jul 17, 2020 at 11:47:06AM -0700, Yonghong Song wrote:
> The BTF_ID_LIST macro definition in btf_ids.h:
>    #define BTF_ID_LIST(name)                \
>    __BTF_ID_LIST(name)                      \
>    extern u32 name[];
> 
> The variable defined in __BTF_ID_LIST has
> ".local" directive, which means the variable
> is only available in the current file.
> So change the scope of "name" in the declaration
> from "extern" to "static".
> 
> Signed-off-by: Yonghong Song <yhs@...com>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  include/linux/btf_ids.h       | 2 +-
>  tools/include/linux/btf_ids.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> index 1cdb56950ffe..cebc9a655959 100644
> --- a/include/linux/btf_ids.h
> +++ b/include/linux/btf_ids.h
> @@ -66,7 +66,7 @@ asm(							\
>  
>  #define BTF_ID_LIST(name)				\
>  __BTF_ID_LIST(name)					\
> -extern u32 name[];
> +static u32 name[];
>  
>  /*
>   * The BTF_ID_UNUSED macro defines 4 zero bytes.
> diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h
> index fe019774f8a7..b870776201e5 100644
> --- a/tools/include/linux/btf_ids.h
> +++ b/tools/include/linux/btf_ids.h
> @@ -64,7 +64,7 @@ asm(							\
>  
>  #define BTF_ID_LIST(name)				\
>  __BTF_ID_LIST(name)					\
> -extern u32 name[];
> +static u32 name[];
>  
>  /*
>   * The BTF_ID_UNUSED macro defines 4 zero bytes.
> -- 
> 2.24.1
>