Commit-ID: a02137eb5177e7afc8dfa52a2888c1f2f4840739
Gitweb: http://git.kernel.org/tip/a02137eb5177e7afc8dfa52a2888c1f2f4840739
Author: Michal Hocko <mhocko@xxxxxxxx>
AuthorDate: Thu, 7 Apr 2016 17:12:28 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: Signed-off-by: Jason Low <jason.low2@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: linux-alpha@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: linux-ia64@xxxxxxxxxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: linux-sh@xxxxxxxxxxxxxxx
Cc: linux-xtensa@xxxxxxxxxxxxxxxx
Cc: sparclinux@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1460041951-22347-9-git-send-email-mhocko@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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
*/
--
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