linux-kernel - [PATCH v3 09/15] kbuild: stop merging *.symversions

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Date:   Thu,  5 May 2022 16:22:38 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Nicolas Schier a <nicolas@...sle.eu>,
        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>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v3 09/15] kbuild: stop merging *.symversions

Now modpost reads symbol versions from .*.cmd files.

These merged *.symversions are not used any more.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

(no changes since v1)

 scripts/Makefile.build  | 21 ++-------------------
 scripts/link-vmlinux.sh | 15 ---------------
 2 files changed, 2 insertions(+), 34 deletions(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index ddd9080fc028..dff9220135c4 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -390,17 +390,6 @@ $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
 $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
 $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
 
-# combine symversions for later processing
-ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
-      cmd_update_lto_symversions =					\
-	rm -f $@...mversions						\
-	$(foreach n, $(filter-out FORCE,$^),				\
-		$(if $(shell test -s $(n).symversions && echo y),	\
-			; cat $(n).symversions >> $@...mversions))
-else
-      cmd_update_lto_symversions = echo >/dev/null
-endif
-
 #
 # Rule to compile a set of .o files into one .a file (without symbol table)
 #
@@ -408,11 +397,8 @@ endif
 quiet_cmd_ar_builtin = AR      $@
       cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
 
-quiet_cmd_ar_and_symver = AR      $@
-      cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
-
 $(obj)/built-in.a: $(real-obj-y) FORCE
-	$(call if_changed,ar_and_symver)
+	$(call if_changed,ar_builtin)
 
 #
 # Rule to create modules.order file
@@ -432,16 +418,13 @@ $(obj)/modules.order: $(obj-m) FORCE
 #
 # Rule to compile a set of .o files into one .a file (with symbol table)
 #
-quiet_cmd_ar_lib = AR      $@
-      cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
 
 $(obj)/lib.a: $(lib-y) FORCE
-	$(call if_changed,ar_lib)
+	$(call if_changed,ar)
 
 ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
 quiet_cmd_link_multi-m = AR [M]  $@
 cmd_link_multi-m =						\
-	$(cmd_update_lto_symversions);				\
 	rm -f $@; 						\
 	$(AR) cDPrsT $@ @$(patsubst %.o,%.mod,$@)
 else
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 2742b7dd089a..07333181938b 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -56,20 +56,6 @@ gen_initcalls()
 		> .tmp_initcalls.lds
 }
 
-# If CONFIG_LTO_CLANG is selected, collect generated symbol versions into
-# .tmp_symversions.lds
-gen_symversions()
-{
-	info GEN .tmp_symversions.lds
-	rm -f .tmp_symversions.lds
-
-	for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
-		if [ -f ${o}.symversions ]; then
-			cat ${o}.symversions >> .tmp_symversions.lds
-		fi
-	done
-}
-
 # Link of vmlinux.o used for section mismatch analysis
 # ${1} output file
 modpost_link()
@@ -299,7 +285,6 @@ cleanup()
 	rm -f .btf.*
 	rm -f .tmp_System.map
 	rm -f .tmp_initcalls.lds
-	rm -f .tmp_symversions.lds
 	rm -f .tmp_vmlinux*
 	rm -f System.map
 	rm -f vmlinux
-- 
2.32.0