linux-kernel - Re: [PATCH v2 21/26] genksyms: adjust the output format for .cmd files

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Date:   Wed, 4 May 2022 22:22:59 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2 21/26] genksyms: adjust the output format for .cmd
 files

On sø. 01. mai 2022 kl. 17.40 Masahiro Yamada wrote:
> genksyms output symbol versions in the linker script format.

output -> outputs ?

> The output format depends on CONFIG_MODULE_REL_CRCS.

Looking at the patch itself, I think the sentence above should be 
inverted, as all rel_crc special handling is removed.  Or did I get it 
wrong?

Kind regards,
Nicolas

> 
> Now, symbol versions are passed to modpost as plain text data,
> we can simplify the genksyms code.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
> Changes in v2:
>   - New patch
> 
>  scripts/Makefile.build      |  9 ---------
>  scripts/genksyms/genksyms.c | 17 ++++-------------
>  2 files changed, 4 insertions(+), 22 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 10092efb61ac..1f480e4ff70a 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -128,7 +128,6 @@ $(obj)/%.i: $(src)/%.c FORCE
>  
>  genksyms = scripts/genksyms/genksyms		\
>  	$(if $(1), -T $(2))			\
> -	$(if $(CONFIG_MODULE_REL_CRCS), -R)	\
>  	$(if $(KBUILD_PRESERVE), -p)		\
>  	-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
>  
> @@ -166,18 +165,10 @@ ifdef CONFIG_MODVERSIONS
>  # o modpost will extract versions from the .cmd file and create linker
>  #   scripts used to link the kernel and/or modules.
>  
> -genksyms_format_rel_crc := [^_]*__crc_\([^ ]*\) = \.; LONG(\([^)]*\)).*
> -genksyms_format_normal := __crc_\(.*\) = \(.*\);
> -genksyms_format := $(if $(CONFIG_MODULE_REL_CRCS),$(genksyms_format_rel_crc),$(genksyms_format_normal))
> -
>  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 4827c5abe5b7..ec5ad4405483 100644
> --- a/scripts/genksyms/genksyms.c
> +++ b/scripts/genksyms/genksyms.c
> @@ -33,7 +33,7 @@ char *cur_filename;
>  int in_source_file;
>  
>  static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
> -	   flag_preserve, flag_warnings, flag_rel_crcs;
> +	   flag_preserve, flag_warnings;
>  
>  static int errors;
>  static int nsyms;
> @@ -680,11 +680,7 @@ void export_symbol(const char *name)
>  		if (flag_dump_defs)
>  			fputs(">\n", debugfile);
>  
> -		/* Used as a linker script. */
> -		printf(!flag_rel_crcs ? "__crc_%s = 0x%08lx;\n" :
> -		       "SECTIONS { .rodata : ALIGN(4) { "
> -		       "__crc_%s = .; LONG(0x%08lx); } }\n",
> -		       name, crc);
> +		printf("#SYMVER %s 0x%08lx\n", name, crc);
>  	}
>  }
>  
> @@ -745,7 +741,6 @@ static void genksyms_usage(void)
>  	      "  -q                    Disable warnings (default)\n"
>  	      "  -h                    Print this message\n"
>  	      "  -V                    Print the release version\n"
> -	      "  -R                    Emit section relative symbol CRCs\n"
>  #endif				/* __GNU_LIBRARY__ */
>  	      , stderr);
>  }
> @@ -766,14 +761,13 @@ int main(int argc, char **argv)
>  		{"preserve", 0, 0, 'p'},
>  		{"version", 0, 0, 'V'},
>  		{"help", 0, 0, 'h'},
> -		{"relative-crc", 0, 0, 'R'},
>  		{0, 0, 0, 0}
>  	};
>  
> -	while ((o = getopt_long(argc, argv, "s:dwqVDr:T:phR",
> +	while ((o = getopt_long(argc, argv, "s:dwqVDr:T:ph",
>  				&long_opts[0], NULL)) != EOF)
>  #else				/* __GNU_LIBRARY__ */
> -	while ((o = getopt(argc, argv, "s:dwqVDr:T:phR")) != EOF)
> +	while ((o = getopt(argc, argv, "s:dwqVDr:T:ph")) != EOF)
>  #endif				/* __GNU_LIBRARY__ */
>  		switch (o) {
>  		case 'd':
> @@ -813,9 +807,6 @@ int main(int argc, char **argv)
>  		case 'h':
>  			genksyms_usage();
>  			return 0;
> -		case 'R':
> -			flag_rel_crcs = 1;
> -			break;
>  		default:
>  			genksyms_usage();
>  			return 1;
> -- 
> 2.32.0

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