Index: arch/amd64/Makefile.inc
===================================================================
--- arch/amd64/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/amd64/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -43,5 +43,5 @@
 endif
 
-CFLAGS += -fno-unwind-tables -m64 -mcmodel=kernel -mno-red-zone -O3
+CFLAGS += -fno-unwind-tables -m64 -mcmodel=kernel -mno-red-zone
 DEFS += -D_CPU=${CPU}
 
Index: arch/ia32/Makefile.inc
===================================================================
--- arch/ia32/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/ia32/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -43,5 +43,4 @@
 endif
 
-CFLAGS += -O3
 DEFS += -D_CPU=${CPU}
 
Index: arch/ia64/Makefile.inc
===================================================================
--- arch/ia64/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/ia64/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -39,5 +39,5 @@
 #
 
-CFLAGS += -mconstant-gp -fno-unwind-tables -minline-int-divide-min-latency -O3
+CFLAGS += -mconstant-gp -fno-unwind-tables -minline-int-divide-min-latency
 LFLAGS += -EL
 AFLAGS += -mconstant-gp
Index: arch/mips32/Makefile.inc
===================================================================
--- arch/mips32/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/mips32/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -42,5 +42,5 @@
 
 KERNEL_LOAD_ADDRESS = 0x80100000
-CFLAGS += -mno-abicalls -G 0 -fno-zero-initialized-in-bss -O2
+CFLAGS += -mno-abicalls -G 0 -fno-zero-initialized-in-bss
 DEFS += -DMACHINE=${MACHINE} -DKERNEL_LOAD_ADDRESS=${KERNEL_LOAD_ADDRESS}
 
Index: arch/ppc32/Makefile.inc
===================================================================
--- arch/ppc32/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/ppc32/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -39,5 +39,4 @@
 #
 
-CFLAGS += -O3
 LFLAGS += -no-check-sections -N
 
Index: arch/sparc64/Makefile.inc
===================================================================
--- arch/sparc64/Makefile.inc	(revision abb79e842157f3773366cc51ec97511f3014a5cd)
+++ arch/sparc64/Makefile.inc	(revision feb1a4141fd0d63c75a526e5c9edb96d92157e55)
@@ -39,5 +39,5 @@
 #
 
-CFLAGS += -mcpu=ultrasparc -m64 -O3
+CFLAGS += -mcpu=ultrasparc -m64
 LFLAGS += -no-check-sections -N