mm: updates from linux 3.4.48
memory.c: update to linux 3.3.y
memory.c: update to linux 3.4.48
mm: updates from linux 3.4.48
mm: more updates to linux 3.4.48 + introduce vm_brk() & vm_munmap() & vm_mmap() + backport aio from linux 3.4.48 + some stuff to make these functions fully working :)