From: Vlastimil Babka <vbabka@suse.cz>
Date: Mon, 23 Aug 2021 23:59:01 +0000 (+1000)
Subject: mm, slub: don't disable irqs in slub_cpu_dead()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1e571e786dd50492d99586f8bbc48dfa86b7a08d;p=users%2Fjedix%2Flinux-maple.git

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 fc09ec3563b4d..ddcaddc5e8017 100644
--- 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;
 }