switched to -O2 optimization
Conflicts:

	arch/arm/configs/sultan_defconfig
silenced some warnings when compiling with -Ofast or -O3 (credit: Show-p1984)
fixed bootloops for some people, switched to -O3

-O3 is the fastest according to benchmarks conducted by Phoronix: http://www.phoronix.com/scan.php?page=article&item=gcc_47_optimizations&num=1
Conflicts:

	Makefile
switched to SLUB and -O3 optimization
Conflicts:

	arch/arm/configs/sultan_defconfig