linux-kernel - [PATCH] mm, slab: remove unneed check in cpuup

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Message-Id: <1553159353-5056-1-git-send-email-lirongqing@baidu.com>
Date:   Thu, 21 Mar 2019 17:09:13 +0800
From:   Li RongQing <lirongqing@...du.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Christoph Lameter <cl@...ux.com>
Subject: [PATCH] mm, slab: remove unneed check in cpuup_canceled

nc is a member of percpu allocation memory, and impossible NULL

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 mm/slab.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 28652e4218e0..f1420e14875a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -990,10 +990,8 @@ static void cpuup_canceled(long cpu)
 
 		/* cpu is dead; no one can alloc from it. */
 		nc = per_cpu_ptr(cachep->cpu_cache, cpu);
-		if (nc) {
-			free_block(cachep, nc->entry, nc->avail, node, &list);
-			nc->avail = 0;
-		}
+		free_block(cachep, nc->entry, nc->avail, node, &list);
+		nc->avail = 0;
 
 		if (!cpumask_empty(mask)) {
 			spin_unlock_irq(&n->list_lock);
-- 
2.16.2