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userns: use irqsave variant of refcount_dec_and_lock()

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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.

[bigeasy@linutronix.de: s@atomic_dec_and_lock@refcount_dec_and_lock@g]
Link: http://lkml.kernel.org/r/20180703200141.28415-7-bigeasy@linutronix.de
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anna-Maria Gleixner 2018-08-21 21:55:42 -07:00 committed by Linus Torvalds
parent fc37191272
commit ce0a568d32
1 changed files with 1 additions and 4 deletions
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5
kernel/user.c
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@ -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)