linux-kernel - [tip:locking/rwsem] locking/rwsem, ia64: Provide __down_write

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Date:	Fri, 22 Apr 2016 02:43:06 -0700
From:	tip-bot for Michal Hocko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, mhocko@...e.com, peterz@...radead.org,
	mingo@...nel.org, jason.low2@...com, jcmvbkbc@...il.com,
	chris@...kel.net, torvalds@...ux-foundation.org,
	tony.luck@...el.com, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	dbueso@...e.de, davem@...emloft.net, hpa@...or.com
Subject: [tip:locking/rwsem] locking/rwsem, ia64: Provide
 __down_write_killable()

Commit-ID:  a02137eb5177e7afc8dfa52a2888c1f2f4840739
Gitweb:     http://git.kernel.org/tip/a02137eb5177e7afc8dfa52a2888c1f2f4840739
Author:     Michal Hocko <mhocko@...e.com>
AuthorDate: Thu, 7 Apr 2016 17:12:28 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Apr 2016 10:42:21 +0200

locking/rwsem, ia64: Provide __down_write_killable()

Introduce ___down_write() for the fast path and reuse it for __down_write()
resp. __down_write_killable() each using the respective generic slow path
(rwsem_down_write_failed() resp. rwsem_down_write_failed_killable()).

Signed-off-by: Michal Hocko <mhocko@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Chris Zankel <chris@...kel.net>
Cc: David S. Miller <davem@...emloft.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Max Filippov <jcmvbkbc@...il.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
Cc: Signed-off-by: Jason Low <jason.low2@...com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-alpha@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-ia64@...r.kernel.org
Cc: linux-s390@...r.kernel.org
Cc: linux-sh@...r.kernel.org
Cc: linux-xtensa@...ux-xtensa.org
Cc: sparclinux@...r.kernel.org
Link: http://lkml.kernel.org/r/1460041951-22347-9-git-send-email-mhocko@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/ia64/include/asm/rwsem.h | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/arch/ia64/include/asm/rwsem.h b/arch/ia64/include/asm/rwsem.h
index ce11247..8b23e07 100644
--- a/arch/ia64/include/asm/rwsem.h
+++ b/arch/ia64/include/asm/rwsem.h
@@ -49,8 +49,8 @@ __down_read (struct rw_semaphore *sem)
 /*
  * lock for writing
  */
-static inline void
-__down_write (struct rw_semaphore *sem)
+static inline long
+___down_write (struct rw_semaphore *sem)
 {
 	long old, new;
 
@@ -59,10 +59,26 @@ __down_write (struct rw_semaphore *sem)
 		new = old + RWSEM_ACTIVE_WRITE_BIAS;
 	} while (cmpxchg_acq(&sem->count, old, new) != old);
 
-	if (old != 0)
+	return old;
+}
+
+static inline void
+__down_write (struct rw_semaphore *sem)
+{
+	if (___down_write(sem))
 		rwsem_down_write_failed(sem);
 }
 
+static inline int
+__down_write_killable (struct rw_semaphore *sem)
+{
+	if (___down_write(sem))
+		if (IS_ERR(rwsem_down_write_failed_killable(sem)))
+			return -EINTR;
+
+	return 0;
+}
+
 /*
  * unlock after reading
  */