From: Anna-Maria Gleixner Date: Wed, 4 Apr 2018 11:43:57 +0200 Subject: [PATCH] userns: Use irqsave variant of refcount_dec_and_lock() Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.18/older/patches-4.18.5-rt3.tar.xz The irqsave variant of refcount_dec_and_lock handles irqsave/restore when taking/releasing the spin lock. With this variant the call of local_irq_save/restore is no longer required. Signed-off-by: Anna-Maria Gleixner [bigeasy: s@atomic_dec_and_lock@refcount_dec_and_lock@g ] Signed-off-by: Sebastian Andrzej Siewior --- kernel/user.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/kernel/user.c +++ b/kernel/user.c @@ -169,11 +169,8 @@ void free_uid(struct user_struct *up) if (!up) return; - local_irq_save(flags); - if (refcount_dec_and_lock(&up->__count, &uidhash_lock)) + if (refcount_dec_and_lock_irqsave(&up->__count, &uidhash_lock, &flags)) free_user(up, flags); - else - local_irq_restore(flags); } struct user_struct *alloc_uid(kuid_t uid)