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Date:   Mon, 20 Jul 2020 21:44:18 +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 v2 2/5] tools/bpf: sync btf_ids.h to tools

On Mon, Jul 20, 2020 at 09:33:59AM -0700, Yonghong Song wrote:
> Sync kernel header btf_ids.h to tools directory.
> Also define macro CONFIG_DEBUG_INFO_BTF before
> including btf_ids.h in prog_tests/resolve_btfids.c
> since non-stub definitions for BTF_ID_LIST etc. macros
> are defined under CONFIG_DEBUG_INFO_BTF. This
> prevented test_progs from failing.

I was going to send this with the d_path change ;-)

thanks,
jirka

> 
> Signed-off-by: Yonghong Song <yhs@...com>
> ---
>  tools/include/linux/btf_ids.h                         | 11 ++++++++++-
>  .../testing/selftests/bpf/prog_tests/resolve_btfids.c |  1 +
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h
> index fe019774f8a7..1cdb56950ffe 100644
> --- a/tools/include/linux/btf_ids.h
> +++ b/tools/include/linux/btf_ids.h
> @@ -3,6 +3,8 @@
>  #ifndef _LINUX_BTF_IDS_H
>  #define _LINUX_BTF_IDS_H
>  
> +#ifdef CONFIG_DEBUG_INFO_BTF
> +
>  #include <linux/compiler.h> /* for __PASTE */
>  
>  /*
> @@ -21,7 +23,7 @@
>  asm(							\
>  ".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
>  ".local " #symbol " ;                          \n"	\
> -".type  " #symbol ", @object;                  \n"	\
> +".type  " #symbol ", STT_OBJECT;               \n"	\
>  ".size  " #symbol ", 4;                        \n"	\
>  #symbol ":                                     \n"	\
>  ".zero 4                                       \n"	\
> @@ -83,5 +85,12 @@ asm(							\
>  ".zero 4                                       \n"	\
>  ".popsection;                                  \n");
>  
> +#else
> +
> +#define BTF_ID_LIST(name) static u32 name[5];
> +#define BTF_ID(prefix, name)
> +#define BTF_ID_UNUSED
> +
> +#endif /* CONFIG_DEBUG_INFO_BTF */
>  
>  #endif
> diff --git a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> index 403be6f36cba..22d83bba4e91 100644
> --- a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> +++ b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> @@ -6,6 +6,7 @@
>  #include <bpf/libbpf.h>
>  #include <linux/btf.h>
>  #include <linux/kernel.h>
> +#define CONFIG_DEBUG_INFO_BTF
>  #include <linux/btf_ids.h>
>  #include "test_progs.h"
>  
> -- 
> 2.24.1
> 

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