locking, percpu_counter: Annotate ::lock as raw

The percpu_counter::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 <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 9 deletions

diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 28f2c33c6b53..f087105ed914 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -59,13 +59,13 @@ void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
 {
         int cpu;
 
-        spin_lock(&fbc->lock);
+        raw_spin_lock(&fbc->lock);
         for_each_possible_cpu(cpu) {
                 s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
                 *pcount = 0;
         }
         fbc->count = amount;
-        spin_unlock(&fbc->lock);
+        raw_spin_unlock(&fbc->lock);
 }
 EXPORT_SYMBOL(percpu_counter_set);
 
@@ -76,10 +76,10 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
         preempt_disable();
         count = __this_cpu_read(*fbc->counters) + amount;
         if (count >= batch || count <= -batch) {
-                spin_lock(&fbc->lock);
+                raw_spin_lock(&fbc->lock);
                 fbc->count += count;
                 __this_cpu_write(*fbc->counters, 0);
-                spin_unlock(&fbc->lock);
+                raw_spin_unlock(&fbc->lock);
         } else {
                 __this_cpu_write(*fbc->counters, count);
         }
@@ -96,13 +96,13 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
         s64 ret;
         int cpu;
 
-        spin_lock(&fbc->lock);
+        raw_spin_lock(&fbc->lock);
         ret = fbc->count;
         for_each_online_cpu(cpu) {
                 s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
                 ret += *pcount;
         }
-        spin_unlock(&fbc->lock);
+        raw_spin_unlock(&fbc->lock);
         return ret;
 }
 EXPORT_SYMBOL(__percpu_counter_sum);
@@ -110,7 +110,7 @@ EXPORT_SYMBOL(__percpu_counter_sum);
 int __percpu_counter_init(struct percpu_counter *fbc, s64 amount,
                           struct lock_class_key *key)
 {
-        spin_lock_init(&fbc->lock);
+        raw_spin_lock_init(&fbc->lock);
         lockdep_set_class(&fbc->lock, key);
         fbc->count = amount;
         fbc->counters = alloc_percpu(s32);
@@ -173,11 +173,11 @@ static int __cpuinit percpu_counter_hotcpu_callback(struct notifier_block *nb,
                 s32 *pcount;
                 unsigned long flags;
 
-                spin_lock_irqsave(&fbc->lock, flags);
+                raw_spin_lock_irqsave(&fbc->lock, flags);
                 pcount = per_cpu_ptr(fbc->counters, cpu);
                 fbc->count += *pcount;
                 *pcount = 0;
-                spin_unlock_irqrestore(&fbc->lock, flags);
+                raw_spin_unlock_irqrestore(&fbc->lock, flags);
         }
         mutex_unlock(&percpu_counters_lock);
 #endif