Update defconfig
Revert "Backport AIO (Asynchronous IO) from Linux 3.5"

This reverts commit 29bbd0b2047f6ab47a0f9a972ef07fa8a154cc38.
Revert "tmpfs: fix mempolicy object leaks"

This reverts commit 5f10960a5cfdf5d010932591656a77235fa8cbfb.
update config and fix mpdecision