linux-kernel - [PATCH] mm/zswap: remove unneeded zswap_rb

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Date:	Wed, 20 Nov 2013 14:47:04 -0500
From:	Dan Streetman <ddstreet@...e.org>
To:	Seth Jennings <sjennings@...iantweb.net>
Cc:	Dan Streetman <ddstreet@...e.org>, linux-mm@...ck.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bob Liu <bob.liu@...cle.com>, Minchan Kim <minchan@...nel.org>,
	Weijie Yang <weijie.yang@...sung.com>
Subject: [PATCH] mm/zswap: remove unneeded zswap_rb_erase calls

Since zswap_rb_erase was added to the final (when refcount == 0)
zswap_put_entry, there is no need to call zswap_rb_erase before
calling zswap_put_entry.

Signed-off-by: Dan Streetman <ddstreet@...e.org>
---
 mm/zswap.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index e154f1e..f4fbbd5 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -711,8 +711,6 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
 		ret = zswap_rb_insert(&tree->rbroot, entry, &dupentry);
 		if (ret == -EEXIST) {
 			zswap_duplicate_entry++;
-			/* remove from rbtree */
-			zswap_rb_erase(&tree->rbroot, dupentry);
 			zswap_entry_put(tree, dupentry);
 		}
 	} while (ret == -EEXIST);
@@ -787,9 +785,6 @@ static void zswap_frontswap_invalidate_page(unsigned type, pgoff_t offset)
 		return;
 	}
 
-	/* remove from rbtree */
-	zswap_rb_erase(&tree->rbroot, entry);
-
 	/* drop the initial reference from entry creation */
 	zswap_entry_put(tree, entry);
 
-- 
1.8.3.1

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