[PATCH 09/23] lib: percpu_counter_init_irq
From: Peter Zijlstra <hidden>
Date: 2007-08-03 12:58:49
Also in:
lkml
provide a way to init percpu_counters that are supposed to be used from irq safe contexts. Signed-off-by: Peter Zijlstra <redacted> --- include/linux/percpu_counter.h | 3 +++ lib/percpu_counter.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) Index: linux-2.6/include/linux/percpu_counter.h ===================================================================
--- linux-2.6.orig/include/linux/percpu_counter.h
+++ linux-2.6/include/linux/percpu_counter.h@@ -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(st return 0; } +#define percpu_counter_init_irq percpu_counter_init + static inline void percpu_counter_destroy(struct percpu_counter *fbc) { }
Index: linux-2.6/lib/percpu_counter.c ===================================================================
--- linux-2.6.orig/lib/percpu_counter.c
+++ linux-2.6/lib/percpu_counter.c@@ -68,6 +68,8 @@ s64 __percpu_counter_sum(struct percpu_c } 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_co } 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) -- --
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