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lib: percpu_counter_init_irq 

provide a way to tell lockdep about percpu_counters that are supposed to be
used from irq safe contexts.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2007-10-16 23:25:46 -07:00 committed by Linus Torvalds
parent 833f4077bf
commit dc62a30e27
2 changed files with 15 additions and 0 deletions
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3
include/linux/percpu_counter.h
View File

@ -31,6 +31,7 @@ struct percpu_counter {
#endif #endif
int percpu_counter_init(struct percpu_counter *fbc, s64 amount); int percpu_counter_init(struct percpu_counter *fbc, s64 amount);
int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount);
void percpu_counter_destroy(struct percpu_counter *fbc); void percpu_counter_destroy(struct percpu_counter *fbc);
void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
@ -84,6 +85,8 @@ static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
return 0; return 0;
} }
#define percpu_counter_init_irq percpu_counter_init
static inline void percpu_counter_destroy(struct percpu_counter *fbc) static inline void percpu_counter_destroy(struct percpu_counter *fbc)
{ {
} }

12
lib/percpu_counter.c
View File

@ -68,6 +68,8 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
} }
EXPORT_SYMBOL(__percpu_counter_sum); EXPORT_SYMBOL(__percpu_counter_sum);
static struct lock_class_key percpu_counter_irqsafe;
int percpu_counter_init(struct percpu_counter *fbc, s64 amount) int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{ {
spin_lock_init(&fbc->lock); spin_lock_init(&fbc->lock);
@ -84,6 +86,16 @@ int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
} }
EXPORT_SYMBOL(percpu_counter_init); EXPORT_SYMBOL(percpu_counter_init);
int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount)
{
int err;
err = percpu_counter_init(fbc, amount);
if (!err)
lockdep_set_class(&fbc->lock, &percpu_counter_irqsafe);
return err;
}
void percpu_counter_destroy(struct percpu_counter *fbc) void percpu_counter_destroy(struct percpu_counter *fbc)
{ {
if (!fbc->counters) if (!fbc->counters)