[v2] ftrace: Speed up recordmcount
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Message ID 3dc8cddf022eb7024f9f2cf857529a15bee8999a.1288196498.git.wuzhangjin@gmail.com
State New, archived
Headers show

Commit Message

Wu Zhangjin Oct. 27, 2010, 4:24 p.m. UTC
None

Patch
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diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 5ad25e1..0ad6108 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -214,17 +214,22 @@  ifdef BUILD_C_RECORDMCOUNT
 # The empty.o file is created in the make process in order to determine
 #  the target endianness and word size. It is made before all other C
 #  files, including recordmcount.
-cmd_record_mcount = if [ $(@) != "scripts/mod/empty.o" ]; then			\
-			$(objtree)/scripts/recordmcount "$(@)";			\
-		    fi;
+sub_cmd_record_mcount =					\
+	if [ $(@) != "scripts/mod/empty.o" ]; then	\
+		$(objtree)/scripts/recordmcount "$(@)";	\
+	fi;
 else
-cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
+sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
 	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
 	"$(if $(CONFIG_64BIT),64,32)" \
 	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
 	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
 	"$(if $(part-of-module),1,0)" "$(@)";
 endif
+cmd_record_mcount = 						\
+	if [ "$(findstring -pg,$(_c_flags))" == "-pg" ]; then	\
+		$(sub_cmd_record_mcount)			\
+	fi;
 endif
 
 define rule_cc_o_c