[PATCH] mm, slab: remove unneed check in cpuup_canceled

[Li RongQing]

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

Signed-off-by: Li RongQing <lirongq...@baidu.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