Messages in this thread Patch in this message | | | From | Kyungsik Lee <> | Subject | [PATCH -next 1/2] arm: Remove enforced Os flag for LZ4 decompressor | Date | Mon, 6 May 2013 17:42:54 +0900 |
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-Os is enforced here, based on the test result of decompression time below, slightly faster than -O2.
But further tests with UA show that using -O2 will be the right choice especially in the case of the unaligned access enabled and the gap, few counts in the normal decompression mode is small enough to remove -Os.
Decompression Time(counts) Normal UA enabled -Os 6717 3447 -O2 6720 2728
Note: ARM v7, Kernel 3.4 counter freq. = 32768 HZ UA(Unaligned Access) gcc version 4.6.2
Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Borislav Petkov <bp@alien8.de> Cc: Florian Fainelli <florian@openwrt.org> Cc: Yann Collet <yann.collet.73@gmail.com> --- arch/arm/boot/compressed/Makefile | 3 --- 1 file changed, 3 deletions(-)
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 001a13a..198a4ad 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -27,9 +27,6 @@ OBJS += misc.o decompress.o ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y) OBJS += debug.o endif -ifeq ($(CONFIG_KERNEL_LZ4),y) -CFLAGS_decompress.o := -Os -endif FONTC = $(srctree)/drivers/video/console/font_acorn_8x8.c # string library code (-Os is enforced to keep it much smaller) -- 1.8.1.1
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