s390/spinlock: use the cpu number +1 as spinlock value

The queued spinlock code will come out simpler if the encoding of
the CPU that holds the spinlock is (cpu+1) instead of (~cpu).

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/spinlock.h

@@ -48,7 +48,7 @@ static inline void arch_spin_relax(arch_spinlock_t *lock)
 
 static inline u32 arch_spin_lockval(int cpu)
 {
-	return ~cpu;
+	return cpu + 1;
 }
 
 static inline int arch_spin_value_unlocked(arch_spinlock_t lock)

arch/s390/lib/spinlock.c

@@ -67,8 +67,8 @@ void arch_spin_lock_wait(arch_spinlock_t *lp)
 
 	/* Pass the virtual CPU to the lock holder if it is not running */
 	owner = arch_load_niai4(&lp->lock);
-	if (owner && arch_vcpu_is_preempted(~owner))
-		smp_yield_cpu(~owner);
+	if (owner && arch_vcpu_is_preempted(owner - 1))
+		smp_yield_cpu(owner - 1);
 
 	count = spin_retry;
 	while (1) {
@@ -87,8 +87,8 @@ void arch_spin_lock_wait(arch_spinlock_t *lp)
 		 * yield the CPU unconditionally. For LPAR rely on the
 		 * sense running status.
 		 */
-		if (!MACHINE_IS_LPAR || arch_vcpu_is_preempted(~owner))
-			smp_yield_cpu(~owner);
+		if (!MACHINE_IS_LPAR || arch_vcpu_is_preempted(owner - 1))
+			smp_yield_cpu(owner - 1);
 	}
 }
 EXPORT_SYMBOL(arch_spin_lock_wait);
@@ -102,8 +102,8 @@ void arch_spin_lock_wait_flags(arch_spinlock_t *lp, unsigned long flags)
 
 	/* Pass the virtual CPU to the lock holder if it is not running */
 	owner = arch_load_niai4(&lp->lock);
-	if (owner && arch_vcpu_is_preempted(~owner))
-		smp_yield_cpu(~owner);
+	if (owner && arch_vcpu_is_preempted(owner - 1))
+		smp_yield_cpu(owner - 1);
 
 	count = spin_retry;
 	while (1) {
@@ -124,8 +124,8 @@ void arch_spin_lock_wait_flags(arch_spinlock_t *lp, unsigned long flags)
 		 * yield the CPU unconditionally. For LPAR rely on the
 		 * sense running status.
 		 */
-		if (!MACHINE_IS_LPAR || arch_vcpu_is_preempted(~owner))
-			smp_yield_cpu(~owner);
+		if (!MACHINE_IS_LPAR || arch_vcpu_is_preempted(owner - 1))
+			smp_yield_cpu(owner - 1);
 	}
 }
 EXPORT_SYMBOL(arch_spin_lock_wait_flags);
@@ -158,8 +158,8 @@ void _raw_read_lock_wait(arch_rwlock_t *rw)
 	owner = 0;
 	while (1) {
 		if (count-- <= 0) {
-			if (owner && arch_vcpu_is_preempted(~owner))
-				smp_yield_cpu(~owner);
+			if (owner && arch_vcpu_is_preempted(owner - 1))
+				smp_yield_cpu(owner - 1);
 			count = spin_retry;
 		}
 		old = ACCESS_ONCE(rw->lock);
@@ -198,8 +198,8 @@ void _raw_write_lock_wait(arch_rwlock_t *rw, int prev)
 	owner = 0;
 	while (1) {
 		if (count-- <= 0) {
-			if (owner && arch_vcpu_is_preempted(~owner))
-				smp_yield_cpu(~owner);
+			if (owner && arch_vcpu_is_preempted(owner - 1))
+				smp_yield_cpu(owner - 1);
 			count = spin_retry;
 		}
 		old = ACCESS_ONCE(rw->lock);
@@ -226,8 +226,8 @@ void _raw_write_lock_wait(arch_rwlock_t *rw)
 	owner = 0;
 	while (1) {
 		if (count-- <= 0) {
-			if (owner && arch_vcpu_is_preempted(~owner))
-				smp_yield_cpu(~owner);
+			if (owner && arch_vcpu_is_preempted(owner - 1))
+				smp_yield_cpu(owner - 1);
 			count = spin_retry;
 		}
 		old = ACCESS_ONCE(rw->lock);
@@ -265,8 +265,8 @@ void arch_lock_relax(int cpu)
 {
 	if (!cpu)
 		return;
-	if (MACHINE_IS_LPAR && !arch_vcpu_is_preempted(~cpu))
+	if (MACHINE_IS_LPAR && !arch_vcpu_is_preempted(cpu - 1))
 		return;
-	smp_yield_cpu(~cpu);
+	smp_yield_cpu(cpu - 1);
 }
 EXPORT_SYMBOL(arch_lock_relax);