diff options
| author | Kyungsik Lee <kyungsik.lee@lge.com> | 2013-06-07 10:09:57 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-06-17 18:21:08 +1000 |
| commit | ebf10e3f0d90d6075a4cb5ffa85e9f0e18189883 (patch) | |
| tree | a5f5c5d98aad0028d30d789abffe00f0fc5431b8 /arch | |
| parent | e6647e8ce4b07c43520b27cdfeaf37e2c8de163d (diff) | |
arm: Remove enforced Os flag for LZ4 decompressor
-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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/boot/compressed/Makefile | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 592ede5ab31d..133a16c8e9ac 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) |