Index: linux-2.6.23-rc6/Makefile =================================================================== --- linux-2.6.23-rc6.orig/Makefile 2007-09-21 16:23:55.000000000 +0800 +++ linux-2.6.23-rc6/Makefile 2007-09-21 16:23:56.000000000 +0800 @@ -508,6 +508,9 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) CHECKFLAGS += $(NOSTDINC_FLAGS) +# improve gcc optimization +CFLAGS += $(call cc-option,-funit-at-a-time,) + # warn about C99 declaration after statement CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)