[patch 022/147] mm, slub: discard slabs in unfreeze_partials() without irqs disabled

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From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, slub: discard slabs in unfreeze_partials() without irqs disabled

No need for disabled irqs when discarding slabs, so restore them before
discarding.

Link: https://lkml.kernel.org/r/20210904105003.11688-23-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Qian Cai <quic_qiancai@xxxxxxxxxxx>
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/slub.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/slub.c~mm-slub-discard-slabs-in-unfreeze_partials-without-irqs-disabled
+++ a/mm/slub.c
@@ -2406,6 +2406,8 @@ static void unfreeze_partials(struct kme
 	if (n)
 		spin_unlock(&n->list_lock);
 
+	local_irq_restore(flags);
+
 	while (discard_page) {
 		page = discard_page;
 		discard_page = discard_page->next;
@@ -2415,7 +2417,6 @@ static void unfreeze_partials(struct kme
 		stat(s, FREE_SLAB);
 	}
 
-	local_irq_restore(flags);
 #endif	/* CONFIG_SLUB_CPU_PARTIAL */
 }
 
_




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