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Commit dc62a30e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Linus Torvalds
Browse files

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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 833f4077

include/linux/percpu_counter.h

+3 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ struct percpu_counter { 
#endif



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_set(struct percpu_counter *fbc, s64 amount);

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;

}



#define percpu_counter_init_irq percpu_counter_init



static inline void percpu_counter_destroy(struct percpu_counter *fbc)

{

}

lib/percpu_counter.c

+12 −0
Original line number Diff line number Diff line
@@ -68,6 +68,8 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc) 
}

EXPORT_SYMBOL(__percpu_counter_sum);



static struct lock_class_key percpu_counter_irqsafe;



int percpu_counter_init(struct percpu_counter *fbc, s64 amount)

{

	spin_lock_init(&fbc->lock);
@@ -84,6 +86,16 @@ int percpu_counter_init(struct percpu_counter *fbc, s64 amount) 
}

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)

{

	if (!fbc->counters)