From: Andrew Morton Use kmem_cache_zalloc(), remove large amounts of initialsiation code and ifdeffery. Note: this assumes that memset(*atomic_t, 0) correctly initialises the atomic_t. This is true for all present archtiectures and if it becomes false for a future architecture then we'll need to make large changes all over the place anyway. Signed-off-by: Andrew Morton --- kernel/user.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff -puN kernel/user.c~alloc_uid-cleanup kernel/user.c --- a/kernel/user.c~alloc_uid-cleanup +++ a/kernel/user.c @@ -356,7 +356,7 @@ void free_uid(struct user_struct *up) local_irq_restore(flags); } -struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid) +struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid) { struct hlist_head *hashent = uidhashentry(ns, uid); struct user_struct *up, *new; @@ -371,26 +371,12 @@ struct user_struct * alloc_uid(struct us spin_unlock_irq(&uidhash_lock); if (!up) { - new = kmem_cache_alloc(uid_cachep, GFP_KERNEL); + new = kmem_cache_zalloc(uid_cachep, GFP_KERNEL); if (!new) goto out_unlock; new->uid = uid; atomic_set(&new->__count, 1); - atomic_set(&new->processes, 0); - atomic_set(&new->files, 0); - atomic_set(&new->sigpending, 0); -#ifdef CONFIG_INOTIFY_USER - 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; -#ifdef CONFIG_KEYS - new->uid_keyring = new->session_keyring = NULL; -#endif if (sched_create_user(new) < 0) goto out_free_user; _