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.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 57166582a3f5..884699fa8c1f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -518,8 +518,10 @@ 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
diff --git a/kernel/user.c b/kernel/user.c
index f42a68e008fd..9cb6f6403561 100644
--- 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,
@@ -341,8 +340,9 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
                 atomic_set(&new->inotify_watches, 0);
                 atomic_set(&new->inotify_devs, 0);
 #endif
-
+#ifdef CONFIG_POSIX_MQUEUE
                 new->mq_bytes = 0;
+#endif
                 new->locked_shm = 0;
 
                 if (alloc_uid_keyring(new, current) < 0) {