linux-kernel - [PATCH 2/4] livepatch: use list_is

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Message-Id: <394e9e5ece944969fe1ff4f37c9a73bf5543265e.1449755818.git.geliangtang@163.com>
Date:	Thu, 10 Dec 2015 22:17:16 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>
Cc:	Geliang Tang <geliangtang@....com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Jens Axboe <axboe@...nel.dk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>, Josef Bacik <jbacik@...com>,
	Josh Triplett <josh@...htriplett.org>,
	live-patching@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] livepatch: use list_is_first()

For better readability, use list_is_first() instead of open-coded.

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 kernel/livepatch/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index bc2c85c..be64106 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -479,7 +479,7 @@ static int __klp_enable_patch(struct klp_patch *patch)
 		return -EINVAL;
 
 	/* enforce stacking: only the first disabled patch can be enabled */
-	if (patch->list.prev != &klp_patches &&
+	if (!list_is_first(&patch->list, &klp_patches) &&
 	    list_prev_entry(patch, list)->state == KLP_DISABLED)
 		return -EBUSY;
 
-- 
2.5.0


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