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

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Date:   Tue, 10 Oct 2017 04:03:57 -0700
From:   tip-bot for Kirill Tkhai <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, mingo@...nel.org, ktkhai@...tuozzo.com,
        hpa@...or.com, tglx@...utronix.de
Subject: [tip:locking/core] locking/arch, alpha: Add __down_read_killable()

Commit-ID:  8c74392a8db9f19f7b2d07f3bb7c5accb4cb4702
Gitweb:     https://git.kernel.org/tip/8c74392a8db9f19f7b2d07f3bb7c5accb4cb4702
Author:     Kirill Tkhai <ktkhai@...tuozzo.com>
AuthorDate: Fri, 29 Sep 2017 19:05:56 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 10 Oct 2017 11:50:14 +0200

locking/arch, alpha: 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/150670115677.23930.5711263025537758463.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/alpha/include/asm/rwsem.h | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/arch/alpha/include/asm/rwsem.h b/arch/alpha/include/asm/rwsem.h
index 77873d0..9624cb4 100644
--- a/arch/alpha/include/asm/rwsem.h
+++ b/arch/alpha/include/asm/rwsem.h
@@ -21,7 +21,7 @@
 #define RWSEM_ACTIVE_READ_BIAS		RWSEM_ACTIVE_BIAS
 #define RWSEM_ACTIVE_WRITE_BIAS		(RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
 
-static inline void __down_read(struct rw_semaphore *sem)
+static inline int ___down_read(struct rw_semaphore *sem)
 {
 	long oldcount;
 #ifndef	CONFIG_SMP
@@ -41,10 +41,24 @@ static inline void __down_read(struct rw_semaphore *sem)
 	:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
 	:"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory");
 #endif
-	if (unlikely(oldcount < 0))
+	return (oldcount < 0);
+}
+
+static inline void __down_read(struct rw_semaphore *sem)
+{
+	if (unlikely(___down_read(sem)))
 		rwsem_down_read_failed(sem);
 }
 
+static inline int __down_read_killable(struct rw_semaphore *sem)
+{
+	if (unlikely(___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
  */
@@ -94,9 +108,10 @@ static inline void __down_write(struct rw_semaphore *sem)
 
 static inline int __down_write_killable(struct rw_semaphore *sem)
 {
-	if (unlikely(___down_write(sem)))
+	if (unlikely(___down_write(sem))) {
 		if (IS_ERR(rwsem_down_write_failed_killable(sem)))
 			return -EINTR;
+	}
 
 	return 0;
 }