s390: replace ACCESS_ONCE with READ_ONCE

Remove the last places of ACCESS_ONCE in s390 code.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/spinlock.h

@@ -63,7 +63,7 @@ static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
 
 static inline int arch_spin_is_locked(arch_spinlock_t *lp)
 {
-	return ACCESS_ONCE(lp->lock) != 0;
+	return READ_ONCE(lp->lock) != 0;
 }
 
 static inline int arch_spin_trylock_once(arch_spinlock_t *lp)

arch/s390/kernel/idle.c

@@ -57,8 +57,8 @@ static ssize_t show_idle_count(struct device *dev,
 
 	do {
 		seq = read_seqcount_begin(&idle->seqcount);
-		idle_count = ACCESS_ONCE(idle->idle_count);
-		if (ACCESS_ONCE(idle->clock_idle_enter))
+		idle_count = READ_ONCE(idle->idle_count);
+		if (READ_ONCE(idle->clock_idle_enter))
 			idle_count++;
 	} while (read_seqcount_retry(&idle->seqcount, seq));
 	return sprintf(buf, "%llu\n", idle_count);
@@ -75,9 +75,9 @@ static ssize_t show_idle_time(struct device *dev,
 	do {
 		now = get_tod_clock();
 		seq = read_seqcount_begin(&idle->seqcount);
-		idle_time = ACCESS_ONCE(idle->idle_time);
-		idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
-		idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
+		idle_time = READ_ONCE(idle->idle_time);
+		idle_enter = READ_ONCE(idle->clock_idle_enter);
+		idle_exit = READ_ONCE(idle->clock_idle_exit);
 	} while (read_seqcount_retry(&idle->seqcount, seq));
 	idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
 	return sprintf(buf, "%llu\n", idle_time >> 12);
@@ -93,8 +93,8 @@ cputime64_t arch_cpu_idle_time(int cpu)
 	do {
 		now = get_tod_clock();
 		seq = read_seqcount_begin(&idle->seqcount);
-		idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
-		idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
+		idle_enter = READ_ONCE(idle->clock_idle_enter);
+		idle_exit = READ_ONCE(idle->clock_idle_exit);
 	} while (read_seqcount_retry(&idle->seqcount, seq));
 	return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
 }

arch/s390/lib/spinlock.c

@@ -133,7 +133,7 @@ int arch_spin_trylock_retry(arch_spinlock_t *lp)
 	int count;
 
 	for (count = spin_retry; count > 0; count--) {
-		owner = ACCESS_ONCE(lp->lock);
+		owner = READ_ONCE(lp->lock);
 		/* Try to get the lock if it is free. */
 		if (!owner) {
 			if (_raw_compare_and_swap(&lp->lock, 0, cpu))