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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-12-26 15:08:55 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-29 13:43:00 +0100 |
| commit | ea319518ba3de282c13ae1cf4bf2215c5e03e67e (patch) | |
| tree | 72eea2b8e5d8926e95ade18d610d59b13df5dae5 /lib/percpu_counter.c | |
| parent | 00ef9f7348dfd2fc223ec42aceb30836e86b367f (diff) | |
| download | lwn-ea319518ba3de282c13ae1cf4bf2215c5e03e67e.tar.gz lwn-ea319518ba3de282c13ae1cf4bf2215c5e03e67e.zip | |
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.c | 18 |
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) { |