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>

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 592ede5ab31dd7273ca21cb9538301619b802a0c..133a16c8e9acdb5dbe3823415f9bc7d5ad8960d1 100644 (file)
--- 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)