linux-kernel - [PATCH 2/3] mm/swap: simplify enable_swap_slots

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Date:   Thu, 30 Apr 2020 14:11:42 +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 2/3] mm/swap: simplify enable_swap_slots_cache()

Whether swap_slot_cache_initialized is true or false,
__reenable_swap_slots_cache() is always called. To make this meaning
clear, leave only one call to __reenable_swap_slots_cache(). This also
make it clearer what extra needs be done when swap_slot_cache_initialized
is false.

No functional change.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 mm/swap_slots.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/mm/swap_slots.c b/mm/swap_slots.c
index 01609b5f0c55..b40394473a3c 100644
--- a/mm/swap_slots.c
+++ b/mm/swap_slots.c
@@ -240,21 +240,19 @@ static int free_slot_cache(unsigned int cpu)
 
 int enable_swap_slots_cache(void)
 {
-	int ret = 0;
-
 	mutex_lock(&swap_slots_cache_enable_mutex);
-	if (swap_slot_cache_initialized) {
-		__reenable_swap_slots_cache();
-		goto out_unlock;
-	}
+	if (!swap_slot_cache_initialized) {
+		int ret;
 
-	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "swap_slots_cache",
-				alloc_swap_slot_cache, free_slot_cache);
-	if (WARN_ONCE(ret < 0, "Cache allocation failed (%s), operating "
-			       "without swap slots cache.\n", __func__))
-		goto out_unlock;
+		ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "swap_slots_cache",
+					alloc_swap_slot_cache, free_slot_cache);
+		if (WARN_ONCE(ret < 0, "Cache allocation failed (%s), operating "
+				       "without swap slots cache.\n", __func__))
+			goto out_unlock;
+
+		swap_slot_cache_initialized = true;
+	}
 
-	swap_slot_cache_initialized = true;
 	__reenable_swap_slots_cache();
 out_unlock:
 	mutex_unlock(&swap_slots_cache_enable_mutex);
-- 
2.26.0.106.g9fadedd