diff options
Diffstat (limited to 'arch/s390/lib/spinlock.c')
| -rw-r--r-- | arch/s390/lib/spinlock.c | 33 |
1 files changed, 5 insertions, 28 deletions
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index 3f4d0c69bbfe..ffb15bd4c593 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -17,7 +17,7 @@ int spin_retry = -1; static int __init spin_retry_init(void) { if (spin_retry < 0) - spin_retry = MACHINE_HAS_CAD ? 10 : 1000; + spin_retry = 1000; return 0; } early_initcall(spin_retry_init); @@ -32,11 +32,6 @@ static int __init spin_retry_setup(char *str) } __setup("spin_retry=", spin_retry_setup); -static inline void compare_and_delay(int *lock, int old) -{ - asm(".insn rsy,0xeb0000000022,%0,0,%1" : : "d" (old), "Q" (*lock)); -} - void arch_spin_lock_wait(arch_spinlock_t *lp) { int cpu = SPINLOCK_LOCKVAL; @@ -60,8 +55,6 @@ void arch_spin_lock_wait(arch_spinlock_t *lp) /* Loop for a while on the lock value. */ count = spin_retry; do { - if (MACHINE_HAS_CAD) - compare_and_delay(&lp->lock, owner); owner = ACCESS_ONCE(lp->lock); } while (owner && count-- > 0); if (!owner) @@ -105,8 +98,6 @@ void arch_spin_lock_wait_flags(arch_spinlock_t *lp, unsigned long flags) /* Loop for a while on the lock value. */ count = spin_retry; do { - if (MACHINE_HAS_CAD) - compare_and_delay(&lp->lock, owner); owner = ACCESS_ONCE(lp->lock); } while (owner && count-- > 0); if (!owner) @@ -135,8 +126,7 @@ int arch_spin_trylock_retry(arch_spinlock_t *lp) if (!owner) { if (__atomic_cmpxchg_bool(&lp->lock, 0, cpu)) return 1; - } else if (MACHINE_HAS_CAD) - compare_and_delay(&lp->lock, owner); + } } return 0; } @@ -159,11 +149,8 @@ void _raw_read_lock_wait(arch_rwlock_t *rw) } old = ACCESS_ONCE(rw->lock); owner = ACCESS_ONCE(rw->owner); - if (old < 0) { - if (MACHINE_HAS_CAD) - compare_and_delay(&rw->lock, old); + if (old < 0) continue; - } if (__atomic_cmpxchg_bool(&rw->lock, old, old + 1)) return; } @@ -177,11 +164,8 @@ int _raw_read_trylock_retry(arch_rwlock_t *rw) while (count-- > 0) { old = ACCESS_ONCE(rw->lock); - if (old < 0) { - if (MACHINE_HAS_CAD) - compare_and_delay(&rw->lock, old); + if (old < 0) continue; - } if (__atomic_cmpxchg_bool(&rw->lock, old, old + 1)) return 1; } @@ -212,8 +196,6 @@ void _raw_write_lock_wait(arch_rwlock_t *rw, int prev) } if ((old & 0x7fffffff) == 0 && prev >= 0) break; - if (MACHINE_HAS_CAD) - compare_and_delay(&rw->lock, old); } } EXPORT_SYMBOL(_raw_write_lock_wait); @@ -242,8 +224,6 @@ void _raw_write_lock_wait(arch_rwlock_t *rw) smp_mb(); if ((old & 0x7fffffff) == 0 && prev >= 0) break; - if (MACHINE_HAS_CAD) - compare_and_delay(&rw->lock, old); } } EXPORT_SYMBOL(_raw_write_lock_wait); @@ -257,11 +237,8 @@ int _raw_write_trylock_retry(arch_rwlock_t *rw) while (count-- > 0) { old = ACCESS_ONCE(rw->lock); - if (old) { - if (MACHINE_HAS_CAD) - compare_and_delay(&rw->lock, old); + if (old) continue; - } if (__atomic_cmpxchg_bool(&rw->lock, 0, 0x80000000)) return 1; } |