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locking, percpu counters: introduce separate lock classes

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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>
This commit is contained in:
Peter Zijlstra
2008-12-26 15:08:55 +01:00
committed by Ingo Molnar
parent 00ef9f7348
commit ea319518ba
4 changed files with 18 additions and 22 deletions
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mm/backing-dev.c
+1 -1
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@@ -220,7 +220,7 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->max_prop_frac = PROP_FRAC_BASE;
for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
err = percpu_counter_init_irq(&bdi->bdi_stat[i], 0);
err = percpu_counter_init(&bdi->bdi_stat[i], 0);
if (err)
goto err;
}