linux-kernel - [PATCH 1/3] mm/swap: simplify alloc_swap_slot

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Message-ID: <20200430061143.450-2-thunder.leizhen@huawei.com>
Date:   Thu, 30 Apr 2020 14:11:41 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/3] mm/swap: simplify alloc_swap_slot_cache()

Both "slots" and "slots_ret" are only need to be freed when cache already
allocated. Make them closer, seems more clear.

No functional change.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 mm/swap_slots.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/mm/swap_slots.c b/mm/swap_slots.c
index 0975adc72253..01609b5f0c55 100644
--- a/mm/swap_slots.c
+++ b/mm/swap_slots.c
@@ -136,9 +136,16 @@ static int alloc_swap_slot_cache(unsigned int cpu)
 
 	mutex_lock(&swap_slots_cache_mutex);
 	cache = &per_cpu(swp_slots, cpu);
-	if (cache->slots || cache->slots_ret)
+	if (cache->slots || cache->slots_ret) {
 		/* cache already allocated */
-		goto out;
+		mutex_unlock(&swap_slots_cache_mutex);
+
+		kvfree(slots);
+		kvfree(slots_ret);
+
+		return 0;
+	}
+
 	if (!cache->lock_initialized) {
 		mutex_init(&cache->alloc_lock);
 		spin_lock_init(&cache->free_lock);
@@ -155,15 +162,8 @@ static int alloc_swap_slot_cache(unsigned int cpu)
 	 */
 	mb();
 	cache->slots = slots;
-	slots = NULL;
 	cache->slots_ret = slots_ret;
-	slots_ret = NULL;
-out:
 	mutex_unlock(&swap_slots_cache_mutex);
-	if (slots)
-		kvfree(slots);
-	if (slots_ret)
-		kvfree(slots_ret);
 	return 0;
 }
 
-- 
2.26.0.106.g9fadedd