[PATCH] mm/swap_slots.c: Remove unnecessary NULL pointer check

[Miaohe Lin]

The cache->slots and cache->slots_ret is already checked before we try to
drain it. And kvfree can handle the NULL pointer itself. So remove the
NULL pointer check here.

Signed-off-by: Miaohe Lin <linmia...@huawei.com>
---
 mm/swap_slots.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/swap_slots.c b/mm/swap_slots.c
index 0357fbe70645..4cf99ce033d0 100644
--- a/mm/swap_slots.c
+++ b/mm/swap_slots.c
@@ -178,7 +178,7 @@ static void drain_slots_cache_cpu(unsigned int cpu, 
unsigned int type,
                swapcache_free_entries(cache->slots + cache->cur, cache->nr);
                cache->cur = 0;
                cache->nr = 0;
-               if (free_slots && cache->slots) {
+               if (free_slots) {
                        kvfree(cache->slots);
                        cache->slots = NULL;
                }
@@ -188,13 +188,12 @@ static void drain_slots_cache_cpu(unsigned int cpu, 
unsigned int type,
                spin_lock_irq(&cache->free_lock);
                swapcache_free_entries(cache->slots_ret, cache->n_ret);
                cache->n_ret = 0;
-               if (free_slots && cache->slots_ret) {
+               if (free_slots) {
                        slots = cache->slots_ret;
                        cache->slots_ret = NULL;
                }
                spin_unlock_irq(&cache->free_lock);
-               if (slots)
-                       kvfree(slots);
+               kvfree(slots);
        }
 }
 
-- 
2.19.1