Optimize kernel for cortex-a9

Author: jean-m-cyr

Makefile

@@ -363,9 +363,9 @@ HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 
 HOSTCC       = gcc
 HOSTCXX      = g++
-HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
+HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O3 \
 		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
-HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
+HOSTCXXFLAGS := -O3 $(HOST_LFS_CFLAGS)
 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 
@@ -657,12 +657,14 @@ ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
 else
 ifdef CONFIG_PROFILE_ALL_BRANCHES
-KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS	+= -O3 $(call cc-disable-warning,maybe-uninitialized,)
 else
-KBUILD_CFLAGS   += -O2
+KBUILD_CFLAGS   += -O3
 endif
 endif
 
+KBUILD_CFLAGS += -mtune=cortex-a9
+
 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 			$(call cc-disable-warning,maybe-uninitialized,))