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authorJason Low <jason.low2@hpe.com>2016-06-03 22:26:02 -0700
committerIngo Molnar <mingo@kernel.org>2016-06-08 15:16:42 +0200
commit8ee62b1870be8e630158701632a533d0378e15b8 (patch)
tree18f68e695ee974f059703e75957e201695049cb9 /arch/alpha
parent055ce0fd1b86c204430cbc0887165599d6e15090 (diff)
downloadlinux-8ee62b1870be8e630158701632a533d0378e15b8.tar.bz2
locking/rwsem: Convert sem->count to 'atomic_long_t'
Convert the rwsem count variable to an atomic_long_t since we use it as an atomic variable. This also allows us to remove the rwsem_atomic_{add,update}() "abstraction" which would now be an unnecesary level of indirection. In follow up patches, we also remove the rwsem_atomic_{add,update}() definitions across the various architectures. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Jason Low <jason.low2@hpe.com> [ Build warning fixes on various architectures. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Jason Low <jason.low2@hp.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Terry Rudd <terry.rudd@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Waiman Long <Waiman.Long@hpe.com> Link: http://lkml.kernel.org/r/1465017963-4839-2-git-send-email-jason.low2@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/include/asm/rwsem.h26
1 files changed, 13 insertions, 13 deletions
diff --git a/arch/alpha/include/asm/rwsem.h b/arch/alpha/include/asm/rwsem.h
index 0131a7058778..b40021aabb9f 100644
--- a/arch/alpha/include/asm/rwsem.h
+++ b/arch/alpha/include/asm/rwsem.h
@@ -25,8 +25,8 @@ static inline void __down_read(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
- oldcount = sem->count;
- sem->count += RWSEM_ACTIVE_READ_BIAS;
+ oldcount = sem->count.counter;
+ sem->count.counter += RWSEM_ACTIVE_READ_BIAS;
#else
long temp;
__asm__ __volatile__(
@@ -52,13 +52,13 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
{
long old, new, res;
- res = sem->count;
+ res = atomic_long_read(&sem->count);
do {
new = res + RWSEM_ACTIVE_READ_BIAS;
if (new <= 0)
break;
old = res;
- res = cmpxchg(&sem->count, old, new);
+ res = atomic_long_cmpxchg(&sem->count, old, new);
} while (res != old);
return res >= 0 ? 1 : 0;
}
@@ -67,8 +67,8 @@ static inline long ___down_write(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
- oldcount = sem->count;
- sem->count += RWSEM_ACTIVE_WRITE_BIAS;
+ oldcount = sem->count.counter;
+ sem->count.counter += RWSEM_ACTIVE_WRITE_BIAS;
#else
long temp;
__asm__ __volatile__(
@@ -106,7 +106,7 @@ static inline int __down_write_killable(struct rw_semaphore *sem)
*/
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
- long ret = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
+ long ret = atomic_long_cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
RWSEM_ACTIVE_WRITE_BIAS);
if (ret == RWSEM_UNLOCKED_VALUE)
return 1;
@@ -117,8 +117,8 @@ static inline void __up_read(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
- oldcount = sem->count;
- sem->count -= RWSEM_ACTIVE_READ_BIAS;
+ oldcount = sem->count.counter;
+ sem->count.counter -= RWSEM_ACTIVE_READ_BIAS;
#else
long temp;
__asm__ __volatile__(
@@ -142,8 +142,8 @@ static inline void __up_write(struct rw_semaphore *sem)
{
long count;
#ifndef CONFIG_SMP
- sem->count -= RWSEM_ACTIVE_WRITE_BIAS;
- count = sem->count;
+ sem->count.counter -= RWSEM_ACTIVE_WRITE_BIAS;
+ count = sem->count.counter;
#else
long temp;
__asm__ __volatile__(
@@ -171,8 +171,8 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
- oldcount = sem->count;
- sem->count -= RWSEM_WAITING_BIAS;
+ oldcount = sem->count.counter;
+ sem->count.counter -= RWSEM_WAITING_BIAS;
#else
long temp;
__asm__ __volatile__(