linux-kernel - Re: [PATCH v3 10/15] genksyms: adjust the output format to modpost

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Date:   Thu, 5 May 2022 22:22:49 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-um@...ts.infradead.org,
        linux-s390@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3 10/15] genksyms: adjust the output format to modpost

On Thu, May 05, 2022 at 04:22:39PM +0900 Masahiro Yamada wrote:
> Make genksyms output symbol versions in the format modpost expects,
> so the 'sed' is unneeded.
> 
> This commit makes *.symversions completely unneeded.
> 
> I will keep *.symversions in .gitignore and 'make clean' for a while.
> Otherwise, some people might be upset with 'git status'.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
> (no changes since v2)
> 
> Changes in v2:
>   - New patch
> 
>  scripts/Makefile.build      | 6 ------
>  scripts/genksyms/genksyms.c | 3 +--
>  2 files changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index dff9220135c4..461998a2ad2b 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -165,16 +165,10 @@ ifdef CONFIG_MODVERSIONS
>  # o modpost will extract versions from that file and create *.c files that will
>  #   be compiled and linked to the kernel and/or modules.
>  
> -genksyms_format := __crc_\(.*\) = \(.*\);
> -
>  gen_symversions =								\
>  	if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then			\
>  		$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
> -		    > $@...mversions;						\
> -		sed -n 's/$(genksyms_format)/$(pound)SYMVER \1 \2/p' $@...mversions \
>  			>> $(dot-target).cmd;					\
> -	else									\
> -		rm -f $@...mversions;						\
>  	fi
>  
>  cmd_gen_symversions_c =	$(call gen_symversions,c)
> diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
> index 6e6933ae7911..f5dfdb9d80e9 100644
> --- a/scripts/genksyms/genksyms.c
> +++ b/scripts/genksyms/genksyms.c
> @@ -680,8 +680,7 @@ void export_symbol(const char *name)
>  		if (flag_dump_defs)
>  			fputs(">\n", debugfile);
>  
> -		/* Used as a linker script. */
> -		printf("__crc_%s = 0x%08lx;\n", name, crc);
> +		printf("#SYMVER %s 0x%08lx\n", name, crc);
>  	}
>  }
>  
> -- 
> 2.32.0

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>