linux-kernel - [PATCH 02/12] cfq: don't register propio policy if !CONFIG_CFQ_GROUP

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Date:	Wed, 18 Jan 2012 17:11:20 -0800
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, vgoyal@...hat.com
Cc:	ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/12] cfq: don't register propio policy if !CONFIG_CFQ_GROUP_IOSCHED

cfq has been registering zeroed blkio_poilcy_cfq if CFQ_GROUP_IOSCHED
is disabled.  This fortunately doesn't collide with blk-throtl as
BLKIO_POLICY_PROP is zero but is unnecessary and risky.  Just don't
register it if not enabled.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Vivek Goyal <vgoyal@...hat.com>
---
 block/cfq-iosched.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 9f6219f..5a2e670 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3883,8 +3883,6 @@ static struct blkio_policy_type blkio_policy_cfq = {
 	},
 	.plid = BLKIO_POLICY_PROP,
 };
-#else
-static struct blkio_policy_type blkio_policy_cfq;
 #endif
 
 static int __init cfq_init(void)
@@ -3915,14 +3913,17 @@ static int __init cfq_init(void)
 		return ret;
 	}
 
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
 	blkio_policy_register(&blkio_policy_cfq);
-
+#endif
 	return 0;
 }
 
 static void __exit cfq_exit(void)
 {
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
 	blkio_policy_unregister(&blkio_policy_cfq);
+#endif
 	elv_unregister(&iosched_cfq);
 	kmem_cache_destroy(cfq_pool);
 }
-- 
1.7.7.3

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