mm, slab: lock the correct nodelist after reenabling irqs

mm, slab: lock the correct nodelist after reenabling irqs

cache_grow() can reenable irqs so the cpu (and node) can change, so ensure
that we take list_lock on the correct nodelist.

Fixes an issue with 072bb0aa5e0 ("mm: sl[au]b: add knowledge of PFMEMALLOC
reserve pages") where list_lock for the wrong node was taken after growing
the cache.

Reported-and-tested-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>