locking, lib/proportions: Annotate prop_local_percpu::lock as raw

The prop_local_percpu::lock can be taken in atomic context and therefore
cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>

include/linux/proportions.h

···
 	 */
 	int shift;
 	unsigned long period;
-	spinlock_t lock;		/* protect the snapshot state */
+	raw_spinlock_t lock;		/* protect the snapshot state */
 };
 
 int prop_local_init_percpu(struct prop_local_percpu *pl);
···
 	 */
 	unsigned long period;
 	int shift;
-	spinlock_t lock;		/* protect the snapshot state */
+	raw_spinlock_t lock;		/* protect the snapshot state */
 };
 
 #define INIT_PROP_LOCAL_SINGLE(name)			\
-{	.lock = __SPIN_LOCK_UNLOCKED(name.lock),	\
+{	.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock),	\
 }
 
 int prop_local_init_single(struct prop_local_single *pl);

lib/proportions.c

···
 
 int prop_local_init_percpu(struct prop_local_percpu *pl)
 {
-	spin_lock_init(&pl->lock);
+	raw_spin_lock_init(&pl->lock);
 	pl->shift = 0;
 	pl->period = 0;
 	return percpu_counter_init(&pl->events, 0);
···
 	if (pl->period == global_period)
 		return;
 
-	spin_lock_irqsave(&pl->lock, flags);
+	raw_spin_lock_irqsave(&pl->lock, flags);
 	prop_adjust_shift(&pl->shift, &pl->period, pg->shift);
 
 	/*
···
 		percpu_counter_set(&pl->events, 0);
 
 	pl->period = global_period;
-	spin_unlock_irqrestore(&pl->lock, flags);
+	raw_spin_unlock_irqrestore(&pl->lock, flags);
 }
 
 /*
···
 
 int prop_local_init_single(struct prop_local_single *pl)
 {
-	spin_lock_init(&pl->lock);
+	raw_spin_lock_init(&pl->lock);
 	pl->shift = 0;
 	pl->period = 0;
 	pl->events = 0;
···
 	if (pl->period == global_period)
 		return;
 
-	spin_lock_irqsave(&pl->lock, flags);
+	raw_spin_lock_irqsave(&pl->lock, flags);
 	prop_adjust_shift(&pl->shift, &pl->period, pg->shift);
 	/*
 	 * For each missed period, we half the local counter.
···
 	else
 		pl->events = 0;
 	pl->period = global_period;
-	spin_unlock_irqrestore(&pl->lock, flags);
+	raw_spin_unlock_irqrestore(&pl->lock, flags);
 }
 
 /*