linux-kernel - [PATCH] ipc/mqueue: remove unnecessary rb_init

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Message-ID: <20120718110320.GA32698@google.com>
Date:	Wed, 18 Jul 2012 04:03:20 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	aarcange@...hat.com, dwmw2@...radead.org, riel@...hat.com,
	peterz@...radead.org, daniel.santos@...ox.com, axboe@...nel.dk,
	ebiederm@...ssion.com, akpm@...ux-foundation.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: [PATCH] ipc/mqueue: remove unnecessary rb_init_node calls

I previously sent out my rbtree patches against v3.4, however in private
email Andrew notified me that they broke some builds due to some new
rb_init_node calls that have been introduced after v3.4. No big deal
and it's an easy fix, but I forgot to CC the usual lists and now some
people need the fix in order to try out the patches. So here it is :)

----- Forwarded message from Michel Lespinasse <walken@...gle.com> -----

Date: Tue, 17 Jul 2012 17:30:35 -0700
From: Michel Lespinasse <walken@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Doug Ledford <dledford@...hat.com>
Subject: [PATCH] ipc/mqueue: remove unnecessary rb_init_node calls

Commits d6629859 and ce2d52cc introduced an rbtree of message
priorities, and usage of rb_init_node() to initialize the corresponding
nodes. As it turns out, rb_init_node() is unnecessary here, as the
nodes are fully initialized on insertion by rb_link_node() and the
code doesn't access nodes that aren't inserted on the rbtree.

Removing the rb_init_node() calls as I removed that function during
rbtree API cleanups (the only other use of it was in a place that similarly
didn't require it).

Signed-off-by: Michel Lespinasse <walken@...gle.com>
Acked-by: Doug Ledford <dledford@...hat.com>
---
 ipc/mqueue.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 8ce5769..4439c69 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -142,7 +142,6 @@ static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info)
 		leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC);
 		if (!leaf)
 			return -ENOMEM;
-		rb_init_node(&leaf->rb_node);
 		INIT_LIST_HEAD(&leaf->msg_list);
 		info->qsize += sizeof(*leaf);
 	}
@@ -1041,7 +1040,6 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
 
 	if (!info->node_cache && new_leaf) {
 		/* Save our speculative allocation into the cache */
-		rb_init_node(&new_leaf->rb_node);
 		INIT_LIST_HEAD(&new_leaf->msg_list);
 		info->node_cache = new_leaf;
 		info->qsize += sizeof(*new_leaf);
@@ -1149,7 +1147,6 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
 
 	if (!info->node_cache && new_leaf) {
 		/* Save our speculative allocation into the cache */
-		rb_init_node(&new_leaf->rb_node);
 		INIT_LIST_HEAD(&new_leaf->msg_list);
 		info->node_cache = new_leaf;
 		info->qsize += sizeof(*new_leaf);
-- 
1.7.7.3
--
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