From: Tim Chen <tim.c.chen@linux.intel.com>
To: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Alex Shi <alex.shi@linaro.org>, Andi Kleen <andi@firstfloor.org>,
Michel Lespinasse <walken@google.com>,
Davidlohr Bueso <davidlohr.bueso@hp.com>,
Matthew R Wilcox <matthew.r.wilcox@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Rik van Riel <riel@redhat.com>,
Peter Hurley <peter@hurleysoftware.com>,
"Paul E.McKenney" <paulmck@linux.vnet.ibm.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Jason Low <jason.low2@hp.com>, Waiman Long <Waiman.Long@hp.com>,
linux-kernel@vger.kernel.org, linux-mm <linux-mm@kvack.org>
Subject: [PATCH v8 2/9] rwsem: remove 'out' label in do_wake
Date: Wed, 02 Oct 2013 15:38:22 -0700 [thread overview]
Message-ID: <1380753502.11046.84.camel@schen9-DESK> (raw)
In-Reply-To: <cover.1380748401.git.tim.c.chen@linux.intel.com>
That make code simple and more readable.
Signed-off-by: Alex Shi <alex.shi@intel.com>
---
lib/rwsem.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/lib/rwsem.c b/lib/rwsem.c
index 19c5fa9..42f1b1a 100644
--- a/lib/rwsem.c
+++ b/lib/rwsem.c
@@ -75,7 +75,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, enum rwsem_wake_type wake_type)
* will block as they will notice the queued writer.
*/
wake_up_process(waiter->task);
- goto out;
+ return sem;
}
/* Writers might steal the lock before we grant it to the next reader.
@@ -91,7 +91,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, enum rwsem_wake_type wake_type)
/* A writer stole the lock. Undo our reader grant. */
if (rwsem_atomic_update(-adjustment, sem) &
RWSEM_ACTIVE_MASK)
- goto out;
+ return sem;
/* Last active locker left. Retry waking readers. */
goto try_reader_grant;
}
@@ -136,7 +136,6 @@ __rwsem_do_wake(struct rw_semaphore *sem, enum rwsem_wake_type wake_type)
sem->wait_list.next = next;
next->prev = &sem->wait_list;
- out:
return sem;
}
--
1.7.4.4
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next prev parent reply other threads:[~2013-10-02 22:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1380748401.git.tim.c.chen@linux.intel.com>
2013-10-02 22:38 ` [PATCH v8 0/9] rwsem performance optimizations Tim Chen
2013-10-03 7:32 ` Ingo Molnar
2013-10-07 22:57 ` Tim Chen
2013-10-09 6:15 ` Ingo Molnar
2013-10-09 7:28 ` Peter Zijlstra
2013-10-10 3:14 ` Linus Torvalds
2013-10-10 5:03 ` Davidlohr Bueso
2013-10-09 16:34 ` Tim Chen
2013-10-10 7:54 ` Ingo Molnar
2013-10-16 0:09 ` Tim Chen
2013-10-16 6:55 ` Ingo Molnar
2013-10-16 18:28 ` Tim Chen
2013-11-04 22:36 ` Tim Chen
2013-10-16 21:55 ` Tim Chen
2013-10-18 6:52 ` Ingo Molnar
2013-10-02 22:38 ` [PATCH v8 1/9] rwsem: check the lock before cpmxchg in down_write_trylock Tim Chen
2013-10-02 22:38 ` Tim Chen [this message]
2013-10-02 22:38 ` [PATCH v8 3/9] rwsem: remove try_reader_grant label do_wake Tim Chen
2013-10-02 22:38 ` [PATCH v8 4/9] rwsem/wake: check lock before do atomic update Tim Chen
2013-10-02 22:38 ` [PATCH v8 5/9] MCS Lock: Restructure the MCS lock defines and locking code into its own file Tim Chen
2013-10-08 19:51 ` Rafael Aquini
2013-10-08 20:34 ` Tim Chen
2013-10-08 21:31 ` Rafael Aquini
2013-10-02 22:38 ` [PATCH v8 6/9] MCS Lock: optimizations and extra comments Tim Chen
2013-10-02 22:38 ` [PATCH v8 7/9] MCS Lock: Barrier corrections Tim Chen
2013-10-02 22:38 ` [PATCH v8 8/9] rwsem: do optimistic spinning for writer lock acquisition Tim Chen
2013-10-02 22:38 ` [PATCH v8 9/9] rwsem: reduce spinlock contention in wakeup code path Tim Chen
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