linux-kernel - [PATCH 2/5] mm, swap: Improve readability via make spin

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Date:   Fri, 17 Mar 2017 14:46:20 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com>,
        Huang Ying <ying.huang@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Hugh Dickins <hughd@...gle.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] mm, swap: Improve readability via make spin_lock/unlock balanced

From: Huang Ying <ying.huang@...el.com>

This is just a cleanup patch, no functionality change.  In
cluster_list_add_tail(), spin_lock_nested() is used to lock the
cluster, while unlock_cluster() is used to unlock the cluster.  To
improve the code readability.  Use spin_unlock() directly to unlock
the cluster.

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Acked-by: Tim Chen <tim.c.chen@...el.com>
---
 mm/swapfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6b6bb1bb6209..42fd620dcf4c 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -335,7 +335,7 @@ static void cluster_list_add_tail(struct swap_cluster_list *list,
 		ci_tail = ci + tail;
 		spin_lock_nested(&ci_tail->lock, SINGLE_DEPTH_NESTING);
 		cluster_set_next(ci_tail, idx);
-		unlock_cluster(ci_tail);
+		spin_unlock(&ci_tail->lock);
 		cluster_set_next_flag(&list->tail, idx, 0);
 	}
 }
-- 
2.11.0