void _raw_write_lock_wait(arch_rwlock_t *rw, int prev)
{
int count = spin_retry;
int owner, old;
owner = 0;
while (1) {
if (count-- <= 0) {
if (owner && arch_vcpu_is_preempted(~owner))
smp_yield_cpu(~owner);
count = spin_retry;
}
old = ACCESS_ONCE(rw->lock);
owner = ACCESS_ONCE(rw->owner);
smp_mb();
if (old >= 0) {
prev = __RAW_LOCK(&rw->lock, 0x80000000, __RAW_OP_OR);
old = prev;
}
if ((old & 0x7fffffff) == 0 && prev >= 0)
break;
}
}
void _raw_write_lock_wait(arch_rwlock_t *rw, unsigned int prev)
{
unsigned int owner, old;
int count = spin_retry;
owner = 0;
while (1) {
if (count-- <= 0) {
if (owner && !smp_vcpu_scheduled(~owner))
smp_yield_cpu(~owner);
count = spin_retry;
}
old = ACCESS_ONCE(rw->lock);
owner = ACCESS_ONCE(rw->owner);
smp_rmb();
if ((int) old >= 0) {
prev = __RAW_LOCK(&rw->lock, 0x80000000, __RAW_OP_OR);
old = prev;
}
if ((old & 0x7fffffff) == 0 && (int) prev >= 0)
break;
}
}
void _raw_read_lock_wait(arch_rwlock_t *rw)
{
int count = spin_retry;
int owner, old;
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
__RAW_LOCK(&rw->lock, -1, __RAW_OP_ADD);
#endif
owner = 0;
while (1) {
if (count-- <= 0) {
if (owner && arch_vcpu_is_preempted(~owner))
smp_yield_cpu(~owner);
count = spin_retry;
}
old = ACCESS_ONCE(rw->lock);
owner = ACCESS_ONCE(rw->owner);
if (old < 0)
continue;
if (__atomic_cmpxchg_bool(&rw->lock, old, old + 1))
return;
}
}
void _raw_read_lock_wait(arch_rwlock_t *rw)
{
unsigned int owner, old;
int count = spin_retry;
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
__RAW_LOCK(&rw->lock, -1, __RAW_OP_ADD);
#endif
owner = 0;
while (1) {
if (count-- <= 0) {
if (owner && !smp_vcpu_scheduled(~owner))
smp_yield_cpu(~owner);
count = spin_retry;
}
old = ACCESS_ONCE(rw->lock);
owner = ACCESS_ONCE(rw->owner);
if ((int) old < 0)
continue;
if (_raw_compare_and_swap(&rw->lock, old, old + 1))
return;
}
}
