linux-kernel - [tip:locking/rwsem] locking/rwsem, s390: Provide __down_write

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Message-ID: <tip-4edab14ec66fae5b3c7c4969295facf70365f39d@git.kernel.org>
Date:	Fri, 22 Apr 2016 02:43:29 -0700
From:	tip-bot for Michal Hocko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, chris@...kel.net,
	akpm@...ux-foundation.org, jason.low2@...com, dbueso@...e.de,
	jcmvbkbc@...il.com, davem@...emloft.net, tony.luck@...el.com,
	mhocko@...e.com, torvalds@...ux-foundation.org, tglx@...utronix.de,
	peterz@...radead.org, mingo@...nel.org
Subject: [tip:locking/rwsem] locking/rwsem, s390: Provide
 __down_write_killable()

Commit-ID:  4edab14ec66fae5b3c7c4969295facf70365f39d
Gitweb:     http://git.kernel.org/tip/4edab14ec66fae5b3c7c4969295facf70365f39d
Author:     Michal Hocko <mhocko@...e.com>
AuthorDate: Thu, 7 Apr 2016 17:12:29 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Apr 2016 10:42:22 +0200

locking/rwsem, s390: 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/1460041951-22347-10-git-send-email-mhocko@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/s390/include/asm/rwsem.h | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
index 555d23b..c75e447 100644
--- a/arch/s390/include/asm/rwsem.h
+++ b/arch/s390/include/asm/rwsem.h
@@ -90,7 +90,7 @@ static inline int __down_read_trylock(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)
 {
 	signed long old, new, tmp;
 
@@ -104,10 +104,25 @@ static inline void __down_write(struct rw_semaphore *sem)
 		: "=&d" (old), "=&d" (new), "=Q" (sem->count)
 		: "Q" (sem->count), "m" (tmp)
 		: "cc", "memory");
-	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;
+}
+
 /*
  * trylock for writing -- returns 1 if successful, 0 if contention
  */