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: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/linux/proportions.h

@@ -58,7 +58,7 @@ struct prop_local_percpu {
 	 */
 	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);
@@ -106,11 +106,11 @@ struct prop_local_single {
 	 */
 	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

@@ -190,7 +190,7 @@ prop_adjust_shift(int *pl_shift, unsigned long *pl_period, int new_shift)
 
 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);
@@ -226,7 +226,7 @@ void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
 	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);
 
 	/*
@@ -247,7 +247,7 @@ void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
 		percpu_counter_set(&pl->events, 0);
 
 	pl->period = global_period;
-	spin_unlock_irqrestore(&pl->lock, flags);
+	raw_spin_unlock_irqrestore(&pl->lock, flags);
 }
 
 /*
@@ -324,7 +324,7 @@ void prop_fraction_percpu(struct prop_descriptor *pd,
 
 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;
@@ -356,7 +356,7 @@ void prop_norm_single(struct prop_global *pg, struct prop_local_single *pl)
 	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.
@@ -367,7 +367,7 @@ void prop_norm_single(struct prop_global *pg, struct prop_local_single *pl)
 	else
 		pl->events = 0;
 	pl->period = global_period;
-	spin_unlock_irqrestore(&pl->lock, flags);
+	raw_spin_unlock_irqrestore(&pl->lock, flags);
 }
 
 /*