Revert "readahead: optimize divide/multiply by power of 2 using L/R shift - Fix"

This reverts commit cff651e4bdf028129b85203afc64aa954207f36e.
Revert "readahead: optimize divide/multiply by power of 2 using L/R shift"

This reverts commit 202a70653f7aadce162c98d634bcf89c0eb9da79.
Revert "lib/int_sqrt.c: optimize square root algorithm"

This reverts commit 37ae55a5c39f1bb9a9292d528faa0a1363bdcf14.
Revert "ARM: 7587/1: implement optimized percpu variable access"

This reverts commit ccbba555ec89ec72335391fa5826132874935454.
DEFCONFIG: v003

Signed-off-by: poondog <markj338@gmail.com>