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locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update()

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The rwsem-xadd count has been converted to an atomic variable and the
rwsem code now directly uses atomic_long_add() and
atomic_long_add_return(), so we can remove the arch implementations of
rwsem_atomic_add() and rwsem_atomic_update().

Signed-off-by: Jason Low <jason.low2@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Jason Low <jason.low2@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Henderson <rth@twiddle.net>
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>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jason Low 2016-05-16 17:38:02 -07:00 committed by Ingo Molnar
parent 8ee62b1870
commit d157bd860f
5 changed files with 0 additions and 120 deletions
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42
arch/alpha/include/asm/rwsem.h
View file

@ -191,47 +191,5 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
rwsem_downgrade_wake(sem);
}
static inline void rwsem_atomic_add(long val, struct rw_semaphore *sem)
{
#ifndef CONFIG_SMP
sem->count += val;
#else
long temp;
__asm__ __volatile__(
"1: ldq_l %0,%1\n"
" addq %0,%2,%0\n"
" stq_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (sem->count)
:"Ir" (val), "m" (sem->count));
#endif
}
static inline long rwsem_atomic_update(long val, struct rw_semaphore *sem)
{
#ifndef CONFIG_SMP
sem->count += val;
return sem->count;
#else
long ret, temp;
__asm__ __volatile__(
"1: ldq_l %0,%1\n"
" addq %0,%3,%2\n"
" addq %0,%3,%0\n"
" stq_c %2,%1\n"
" beq %2,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (ret), "=m" (sem->count), "=&r" (temp)
:"Ir" (val), "m" (sem->count));
return ret;
#endif
}
#endif /* __KERNEL__ */
#endif /* _ALPHA_RWSEM_H */

7
arch/ia64/include/asm/rwsem.h
View file

@ -151,11 +151,4 @@ __downgrade_write (struct rw_semaphore *sem)
rwsem_downgrade_wake(sem);
}
/*
* Implement atomic add functionality. These used to be "inline" functions, but GCC v3.1
* doesn't quite optimize this stuff right and ends up with bad calls to fetchandadd.
*/
#define rwsem_atomic_add(delta, sem) atomic64_add(delta, (atomic64_t *)(&(sem)->count))
#define rwsem_atomic_update(delta, sem) atomic64_add_return(delta, (atomic64_t *)(&(sem)->count))
#endif /* _ASM_IA64_RWSEM_H */

37
arch/s390/include/asm/rwsem.h
View file

@ -207,41 +207,4 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
rwsem_downgrade_wake(sem);
}
/*
* implement atomic add functionality
*/
static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
{
signed long old, new;
asm volatile(
" lg %0,%2\n"
"0: lgr %1,%0\n"
" agr %1,%4\n"
" csg %0,%1,%2\n"
" jl 0b"
: "=&d" (old), "=&d" (new), "=Q" (sem->count)
: "Q" (sem->count), "d" (delta)
: "cc", "memory");
}
/*
* implement exchange and add functionality
*/
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
{
signed long old, new;
asm volatile(
" lg %0,%2\n"
"0: lgr %1,%0\n"
" agr %1,%4\n"
" csg %0,%1,%2\n"
" jl 0b"
: "=&d" (old), "=&d" (new), "=Q" (sem->count)
: "Q" (sem->count), "d" (delta)
: "cc", "memory");
return new;
}
#endif /* _S390_RWSEM_H */

18
arch/x86/include/asm/rwsem.h
View file

@ -213,23 +213,5 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
: "memory", "cc");
}
/*
* implement atomic add functionality
*/
static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
{
asm volatile(LOCK_PREFIX _ASM_ADD "%1,%0"
: "+m" (sem->count)
: "er" (delta));
}
/*
* implement exchange and add functionality
*/
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
{
return delta + xadd(&sem->count, delta);
}
#endif /* __KERNEL__ */
#endif /* _ASM_X86_RWSEM_H */

16
include/asm-generic/rwsem.h
View file

@ -106,14 +106,6 @@ static inline void __up_write(struct rw_semaphore *sem)
rwsem_wake(sem);
}
/*
* implement atomic add functionality
*/
static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
{
atomic_long_add(delta, (atomic_long_t *)&sem->count);
}
/*
* downgrade write lock to read lock
*/
@ -134,13 +126,5 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
rwsem_downgrade_wake(sem);
}
/*
* implement exchange and add functionality
*/
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
{
return atomic_long_add_return(delta, (atomic_long_t *)&sem->count);
}
#endif /* __KERNEL__ */
#endif /* _ASM_GENERIC_RWSEM_H */