linux-kernel - [PATCH 3/3] user.c: #ifdef ->mq

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Message-ID: <20070921094010.GC6812@localhost.sw.ru>
Date:	Fri, 21 Sep 2007 13:40:10 +0400
From:	Alexey Dobriyan <adobriyan@...ru>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: [PATCH 3/3] user.c: #ifdef ->mq_bytes

for those who deselect POSIX message queues.

Reduces SLAB size of user_struct from 64 to 32 bytes here,
SLUB size -- from 40 bytes to 32 bytes.

Signed-off-by: Alexey Dobriyan <adobriyan@...ru>
---

 include/linux/sched.h |    2 ++
 kernel/user.c         |    2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -583,8 +583,10 @@ struct user_struct {
 	atomic_t inotify_watches; /* How many inotify watches does this user have? */
 	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
 #endif
+#ifdef CONFIG_POSIX_MQUEUE
 	/* protected by mq_lock	*/
 	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
+#endif
 	unsigned long locked_shm; /* How many pages of mlocked shm ? */
 
 #ifdef CONFIG_KEYS
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -44,7 +44,6 @@ struct user_struct root_user = {
 	.processes	= ATOMIC_INIT(1),
 	.files		= ATOMIC_INIT(0),
 	.sigpending	= ATOMIC_INIT(0),
-	.mq_bytes	= 0,
 	.locked_shm     = 0,
 #ifdef CONFIG_KEYS
 	.uid_keyring	= &root_user_keyring,

-
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