mm.h: readahead 값을 128에서 1024로 증가
Signed-off-by: Seongmin Park <r_data@naver.com>
lib/string: use glibc version

the performance of memcpy and memmove of the general version is very
inefficient, this patch improved them.

Signed-off-by: Miao Xie <miaox*******>
adapted by faux123 for 3.0.13 kernel

Conflicts:

	lib/string.c