linux-kernel - [tip:locking/core] locking/arch, ia64: Add __down_read

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Date:   Tue, 10 Oct 2017 04:04:21 -0700
From:   tip-bot for Kirill Tkhai <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, tglx@...utronix.de,
        peterz@...radead.org, hpa@...or.com, linux-kernel@...r.kernel.org,
        mingo@...nel.org, ktkhai@...tuozzo.com
Subject: [tip:locking/core] locking/arch, ia64: Add __down_read_killable()

Commit-ID:  c0905115a55c8a3011d7b7e6ee5d63653c1e99f1
Gitweb:     https://git.kernel.org/tip/c0905115a55c8a3011d7b7e6ee5d63653c1e99f1
Author:     Kirill Tkhai <ktkhai@...tuozzo.com>
AuthorDate: Fri, 29 Sep 2017 19:06:07 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 10 Oct 2017 11:50:14 +0200

locking/arch, ia64: 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/150670116749.23930.14976888440968191759.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/ia64/include/asm/rwsem.h | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/ia64/include/asm/rwsem.h b/arch/ia64/include/asm/rwsem.h
index 8fa98dd..49f7db0 100644
--- a/arch/ia64/include/asm/rwsem.h
+++ b/arch/ia64/include/asm/rwsem.h
@@ -37,15 +37,31 @@
 /*
  * lock for reading
  */
-static inline void
-__down_read (struct rw_semaphore *sem)
+static inline int
+___down_read (struct rw_semaphore *sem)
 {
 	long result = ia64_fetchadd8_acq((unsigned long *)&sem->count.counter, 1);
 
-	if (result < 0)
+	return (result < 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;
+}
+
 /*
  * lock for writing
  */
@@ -72,9 +88,10 @@ __down_write (struct rw_semaphore *sem)
 static inline int
 __down_write_killable (struct rw_semaphore *sem)
 {
-	if (___down_write(sem))
+	if (___down_write(sem)) {
 		if (IS_ERR(rwsem_down_write_failed_killable(sem)))
 			return -EINTR;
+	}
 
 	return 0;
 }