linux-kernel - [tip:locking/core] locking/arch, s390: Add __down_read

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Date:   Tue, 10 Oct 2017 04:04:44 -0700
From:   tip-bot for Kirill Tkhai <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ktkhai@...tuozzo.com, torvalds@...ux-foundation.org,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, hpa@...or.com, tglx@...utronix.de
Subject: [tip:locking/core] locking/arch, s390: Add __down_read_killable()

Commit-ID:  a61ba2c8a48f150f5e6b6d14328fc7f1aa32969d
Gitweb:     https://git.kernel.org/tip/a61ba2c8a48f150f5e6b6d14328fc7f1aa32969d
Author:     Kirill Tkhai <ktkhai@...tuozzo.com>
AuthorDate: Fri, 29 Sep 2017 19:06:18 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 10 Oct 2017 11:50:15 +0200

locking/arch, s390: Add __down_read_killable()

Similar to __down_write_killable(), and read killable primitive.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: arnd@...db.de
Cc: avagin@...tuozzo.com
Cc: davem@...emloft.net
Cc: fenghua.yu@...el.com
Cc: gorcunov@...tuozzo.com
Cc: heiko.carstens@...ibm.com
Cc: hpa@...or.com
Cc: ink@...assic.park.msu.ru
Cc: mattst88@...il.com
Cc: rientjes@...gle.com
Cc: rth@...ddle.net
Cc: schwidefsky@...ibm.com
Cc: tony.luck@...el.com
Cc: viro@...iv.linux.org.uk
Link: http://lkml.kernel.org/r/150670117817.23930.13068785028558453848.stgit@localhost.localdomain
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 597e7e9..fda9481 100644
--- a/arch/s390/include/asm/rwsem.h
+++ b/arch/s390/include/asm/rwsem.h
@@ -49,7 +49,7 @@
 /*
  * lock for reading
  */
-static inline void __down_read(struct rw_semaphore *sem)
+static inline int ___down_read(struct rw_semaphore *sem)
 {
 	signed long old, new;
 
@@ -62,10 +62,25 @@ static inline void __down_read(struct rw_semaphore *sem)
 		: "=&d" (old), "=&d" (new), "=Q" (sem->count)
 		: "Q" (sem->count), "i" (RWSEM_ACTIVE_READ_BIAS)
 		: "cc", "memory");
-	if (old < 0)
+	return (old < 0);
+}
+
+static inline void __down_read(struct rw_semaphore *sem)
+{
+	if (___down_read(sem))
 		rwsem_down_read_failed(sem);
 }
 
+static inline int __down_read_killable(struct rw_semaphore *sem)
+{
+	if (___down_read(sem)) {
+		if (IS_ERR(rwsem_down_read_failed_killable(sem)))
+			return -EINTR;
+	}
+
+	return 0;
+}
+
 /*
  * trylock for reading -- returns 1 if successful, 0 if contention
  */