From: Alexey Dobriyan 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 Signed-off-by: Andrew Morton --- include/linux/sched.h | 2 ++ kernel/user.c | 1 - 2 files changed, 2 insertions(+), 1 deletion(-) diff -puN include/linux/sched.h~userc-ifdef-mq_bytes include/linux/sched.h --- a/include/linux/sched.h~userc-ifdef-mq_bytes +++ a/include/linux/sched.h @@ -515,8 +515,10 @@ 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 -puN kernel/user.c~userc-ifdef-mq_bytes kernel/user.c --- a/kernel/user.c~userc-ifdef-mq_bytes +++ a/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, _