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locking/rwsem: Convert sem->count to 'atomic_long_t'

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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 <[email protected]>
Signed-off-by: Jason Low <[email protected]>
[ Build warning fixes on various architectures. ]
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Jason Low <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Hurley <[email protected]>
Cc: Terry Rudd <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Waiman Long <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Jason Low 2016-06-03 22:26:02 -07:00 • committed by Ingo Molnar
commit 8ee62b1870
5 changed files with 50 additions and 46 deletions
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26
arch/alpha/include/asm/rwsem.h
View file

@ -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__(