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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-12-26 17:08:55 +0300
committerIngo Molnar <mingo@elte.hu>2008-12-29 15:43:00 +0300
commitea319518ba3de282c13ae1cf4bf2215c5e03e67e (patch)
tree72eea2b8e5d8926e95ade18d610d59b13df5dae5 /lib/percpu_counter.c
parent00ef9f7348dfd2fc223ec42aceb30836e86b367f (diff)
downloadlinux-ea319518ba3de282c13ae1cf4bf2215c5e03e67e.tar.xz
locking, percpu counters: introduce separate lock classes
Impact: fix lockdep false positives Classify percpu_counter instances similar to regular lock objects -- that is, per instantiation site. The networking code has increased its use of percpu_counters, which leads to false positives if they are treated as a single class. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/percpu_counter.c')
-rw-r--r--lib/percpu_counter.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index a8663890a88c..c7fe2e4e8ed1 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -71,11 +71,11 @@ 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)
+int __percpu_counter_init(struct percpu_counter *fbc, s64 amount,
+ struct lock_class_key *key)
{
spin_lock_init(&fbc->lock);
+ lockdep_set_class(&fbc->lock, key);
fbc->count = amount;
fbc->counters = alloc_percpu(s32);
if (!fbc->counters)
@@ -87,17 +87,7 @@ int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
#endif
return 0;
}
-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;
-}
+EXPORT_SYMBOL(__percpu_counter_init);
void percpu_counter_destroy(struct percpu_counter *fbc)
{