mm, slub: check new pages with restored irqs

mm, slub: check new pages with restored irqs

Building on top of the previous patch, re-enable irqs before checking new
pages.  alloc_debug_processing() is now called with enabled irqs so we
need to remove VM_BUG_ON(!irqs_disabled()); in check_slab() - there
doesn't seem to be a need for it anyway.

Link: https://lkml.kernel.org/r/20210805152000.12817-18-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>