[PATCH] powerpc/nohash: Allocate stale_map[cpu] on CPU_UP_PREPARE not CPU_ONLINE

Currently we allocate the stale_map for a cpu when it comes online, this leaves open a small window where a process can be scheduled on the cpu before the stale_map is allocated. Instead allocate the stale_map at CPU_UP_PREPARE time, that way it will be always available before tasks start running.

[PATCH] powerpc/nohash: Allocate stale_map[cpu] on CPU_UP_PREPARE not CPU_ONLINE

Currently we allocate the stale_map for a cpu when it comes online, this leaves open a small window where a process can be scheduled on the cpu before the stale_map is allocated. Instead allocate the stale_map at CPU_UP_PREPARE time, that way it will be always available before tasks start running.