From: Michel Lespinasse <walken@google.com>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, aquini@redhat.com,
lwoodman@redhat.com, jeremy@goop.org,
Jan Beulich <JBeulich@novell.com>,
Thomas Gleixner <tglx@linutronix.de>,
Eric Dumazet <edumazet@google.com>,
Tom Herbert <therbert@google.com>
Subject: [PATCH 1/2] x86,smp: simplify __ticket_spin_lock
Date: Tue, 1 Jan 2013 16:09:35 -0800 [thread overview]
Message-ID: <20130102000935.GB13678@google.com> (raw)
In-Reply-To: <20130102000653.GA13678@google.com>
Just cosmetic - avoid an unnecessary goto construct
Signed-off-by: Michel Lespinasse <walken@google.com>
---
arch/x86/include/asm/spinlock.h | 7 ++-----
1 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index 2a45eb0cdb2c..19e8a36b3b83 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -55,11 +55,8 @@ static __always_inline void __ticket_spin_lock(arch_spinlock_t *lock)
inc = xadd(&lock->tickets, inc);
- if (inc.head == inc.tail)
- goto out;
-
- ticket_spin_lock_wait(lock, inc);
- out:
+ if (inc.head != inc.tail)
+ ticket_spin_lock_wait(lock, inc);
barrier(); /* make sure nothing creeps before the lock is taken */
}
--
1.7.7.3
next prev parent reply other threads:[~2013-01-02 0:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-21 23:49 [RFC PATCH 0/3] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Rik van Riel
2012-12-21 23:50 ` [RFC PATCH 1/3] x86,smp: move waiting on contended lock out of line Rik van Riel
2012-12-22 3:05 ` Steven Rostedt
2012-12-22 4:40 ` Michel Lespinasse
2012-12-22 4:48 ` Rik van Riel
2012-12-23 22:52 ` Rafael Aquini
2012-12-21 23:51 ` [RFC PATCH 2/3] x86,smp: proportional backoff for ticket spinlocks Rik van Riel
2012-12-22 3:07 ` Steven Rostedt
2012-12-22 3:14 ` Steven Rostedt
2012-12-22 3:47 ` Rik van Riel
2012-12-22 4:44 ` Michel Lespinasse
2012-12-23 22:55 ` Rafael Aquini
2012-12-21 23:51 ` [RFC PATCH 3/3] x86,smp: auto tune spinlock backoff delay factor Rik van Riel
2012-12-21 23:56 ` [RFC PATCH 3/3 -v2] " Rik van Riel
2012-12-22 0:18 ` Eric Dumazet
2012-12-22 2:43 ` Rik van Riel
2012-12-22 0:48 ` Eric Dumazet
2012-12-22 2:57 ` Rik van Riel
2012-12-22 3:29 ` Eric Dumazet
2012-12-22 3:44 ` Rik van Riel
2012-12-22 3:33 ` Steven Rostedt
2012-12-22 3:50 ` Rik van Riel
2012-12-26 19:10 ` Eric Dumazet
2012-12-26 19:27 ` Eric Dumazet
2012-12-26 19:51 ` Rik van Riel
2012-12-27 6:07 ` Michel Lespinasse
2012-12-27 14:27 ` Eric Dumazet
2012-12-27 14:35 ` Rik van Riel
2012-12-27 18:41 ` Jan Beulich
2012-12-27 19:09 ` Rik van Riel
2013-01-03 9:05 ` Jan Beulich
2013-01-03 13:24 ` Steven Rostedt
2013-01-03 13:35 ` Eric Dumazet
2013-01-03 15:32 ` Steven Rostedt
2013-01-03 16:10 ` Eric Dumazet
2013-01-03 16:45 ` Steven Rostedt
2013-01-03 17:54 ` Eric Dumazet
2012-12-27 18:49 ` Eric Dumazet
2012-12-27 19:31 ` Rik van Riel
2012-12-29 0:42 ` Eric Dumazet
2012-12-29 10:27 ` Michel Lespinasse
2013-01-03 18:17 ` Eric Dumazet
2012-12-22 0:47 ` [RFC PATCH 3/3] " David Daney
2012-12-22 2:51 ` Rik van Riel
2012-12-22 3:49 ` Steven Rostedt
2012-12-22 3:58 ` Rik van Riel
2012-12-23 23:08 ` Rafael Aquini
2012-12-22 5:42 ` Michel Lespinasse
2012-12-22 14:32 ` Rik van Riel
2013-01-02 0:06 ` ticket spinlock proportional backoff experiments Michel Lespinasse
2013-01-02 0:09 ` Michel Lespinasse [this message]
2013-01-02 15:31 ` [PATCH 1/2] x86,smp: simplify __ticket_spin_lock Rik van Riel
2013-01-02 0:10 ` [PATCH 2/2] x86,smp: proportional backoff for ticket spinlocks Michel Lespinasse
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