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

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Date:   Sun,  1 May 2022 17:40:27 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v2 21/26] genksyms: adjust the output format for .cmd files

genksyms output symbol versions in the linker script format.
The output format depends on CONFIG_MODULE_REL_CRCS.

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