mm, slub: don't disable irqs in slub_cpu_dead()

slub_cpu_dead() cleans up for an offlined cpu from another cpu and calls
only functions that are now irq safe, so we don't need to disable irqs
anymore.

Link: https://lkml.kernel.org/r/20210805152000.12817-28-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>

diff --git a/mm/slub.c b/mm/slub.c
index fc09ec3563b4d11e244f2a6df88e5ac0db2053c7..ddcaddc5e80172f82a2e3221fc3da7fee68b0bc5 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2540,14 +2540,10 @@ static void flush_all(struct kmem_cache *s)
 static int slub_cpu_dead(unsigned int cpu)
 {
        struct kmem_cache *s;
-       unsigned long flags;
 
        mutex_lock(&slab_mutex);
-       list_for_each_entry(s, &slab_caches, list) {
-               local_irq_save(flags);
+       list_for_each_entry(s, &slab_caches, list)
                __flush_cpu_slab(s, cpu);
-               local_irq_restore(flags);
-       }
        mutex_unlock(&slab_mutex);
        return 0;
 }