linux-kernel - Re: [PATCH] modpost: remove unused Elf

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Date:   Tue, 2 Aug 2022 10:35:44 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] modpost: remove unused Elf_Sword macro

On Tue, Jul 26, 2022 at 9:53 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Commit 9ad21c3f3ecf ("kbuild: try harder to find symbol names in
> modpost") added Elf_Sword (in a wrong way), but did not use it at all.
>
> BTW, the current code looks weird.
>
> The fix for the 32-bit part would be:
>
>     Elf64_Sword    -->    Elf32_Sword
>
> (weirdness in the prefix, Elf32_ vs Elf64_)
>
> The fix for the 64-bit part would be:
>
>     Elf64_Sxword   -->    Elf64_Sword
>
> (the size is different between Sword and Sxword)
>
> Note:
>
>     Elf32_Sword   ==  Elf64_Sword   ==  int32_t
>     Elf32_Sxword  ==  Elf64_Sxword  ==  int64_t
>
> Anyway, let's drop unused code instead of fixing it.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
>  scripts/mod/modpost.h | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
> index 68cd4aeeae3d..620f2fd08e05 100644
> --- a/scripts/mod/modpost.h
> +++ b/scripts/mod/modpost.h
> @@ -26,7 +26,6 @@
>  #define Elf_Shdr    Elf32_Shdr
>  #define Elf_Sym     Elf32_Sym
>  #define Elf_Addr    Elf32_Addr
> -#define Elf_Sword   Elf64_Sword
>  #define Elf_Section Elf32_Half
>  #define ELF_ST_BIND ELF32_ST_BIND
>  #define ELF_ST_TYPE ELF32_ST_TYPE
> @@ -41,7 +40,6 @@
>  #define Elf_Shdr    Elf64_Shdr
>  #define Elf_Sym     Elf64_Sym
>  #define Elf_Addr    Elf64_Addr
> -#define Elf_Sword   Elf64_Sxword
>  #define Elf_Section Elf64_Half
>  #define ELF_ST_BIND ELF64_ST_BIND
>  #define ELF_ST_TYPE ELF64_ST_TYPE
> --
> 2.34.1
>


-- 
Thanks,
~Nick Desaulniers