From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 6/6] userns: Use irqsave variant of refcount_dec_and_lock()
Date: Tue, 3 Jul 2018 22:01:41 +0200 [thread overview]
Message-ID: <20180703200141.28415-7-bigeasy@linutronix.de> (raw)
In-Reply-To: <20180703200141.28415-1-bigeasy@linutronix.de>
From: Anna-Maria Gleixner <anna-maria@linutronix.de>
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.
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
[bigeasy: s@atomic_dec_and_lock@refcount_dec_and_lock@g ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/user.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/kernel/user.c b/kernel/user.c
index 5f65ef195259..0df9b1640b2a 100644
--- 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)
--
2.18.0
prev parent reply other threads:[~2018-07-03 20:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 20:01 [PATCH 0/6] use irqsafe variant of refcount_dec_and_lock() / atomic_dec_and_lock() Sebastian Andrzej Siewior
2018-07-03 20:01 ` [PATCH 1/6] drivers/md/raid5: Use irqsave variant of atomic_dec_and_lock() Sebastian Andrzej Siewior
2018-07-16 12:27 ` Sebastian Andrzej Siewior
2018-07-17 0:37 ` Shaohua Li
2018-07-18 10:57 ` Sebastian Andrzej Siewior
2018-07-19 2:44 ` Shaohua Li
2018-07-19 7:35 ` Sebastian Andrzej Siewior
2018-07-03 20:01 ` [PATCH 2/6] drivers/md/raid5: Do not disable irq on release_inactive_stripe_list() call Sebastian Andrzej Siewior
2018-07-20 8:29 ` Sebastian Andrzej Siewior
2018-07-03 20:01 ` [PATCH 3/6] bdi: Use refcount_t for reference counting instead atomic_t Sebastian Andrzej Siewior
2018-07-16 12:30 ` Sebastian Andrzej Siewior
2018-07-16 22:57 ` Andrew Morton
2018-07-17 15:56 ` Sebastian Andrzej Siewior
2018-07-03 20:01 ` [PATCH 4/6] bdi: Use irqsave variant of refcount_dec_and_lock() Sebastian Andrzej Siewior
2018-07-03 20:01 ` [PATCH 5/6] userns: Use refcount_t for reference counting instead atomic_t Sebastian Andrzej Siewior
2018-07-16 12:39 ` Sebastian Andrzej Siewior
2018-07-03 20:01 ` Sebastian Andrzej Siewior [this message]
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