locking/atomics: Flip atomic_fetch_or() arguments

All the atomic operations have their arguments the wrong way around;
make atomic_fetch_or() consistent and flip them.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/atomic.h

@@ -560,11 +560,11 @@ static inline int atomic_dec_if_positive(atomic_t *v)
 
 /**
  * atomic_fetch_or - perform *p |= mask and return old value of *p
- * @p: pointer to atomic_t
  * @mask: mask to OR on the atomic_t
+ * @p: pointer to atomic_t
  */
 #ifndef atomic_fetch_or
-static inline int atomic_fetch_or(atomic_t *p, int mask)
+static inline int atomic_fetch_or(int mask, atomic_t *p)
 {
 	int old, val = atomic_read(p);
 

kernel/time/tick-sched.c

@@ -262,7 +262,7 @@ static void tick_nohz_dep_set_all(atomic_t *dep,
 {
 	int prev;
 
-	prev = atomic_fetch_or(dep, BIT(bit));
+	prev = atomic_fetch_or(BIT(bit), dep);
 	if (!prev)
 		tick_nohz_full_kick_all();
 }
@@ -292,7 +292,7 @@ void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit)
 
 	ts = per_cpu_ptr(&tick_cpu_sched, cpu);
 
-	prev = atomic_fetch_or(&ts->tick_dep_mask, BIT(bit));
+	prev = atomic_fetch_or(BIT(bit), &ts->tick_dep_mask);
 	if (!prev) {
 		preempt_disable();
 		/* Perf needs local kick that is NMI safe */