linux-kernel - Re: [RFC][PATCH v2 02/11] perf: core, add pmu register and lookup functions

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Date:	Tue, 18 May 2010 22:38:58 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>,
	"greg@...ah.com" <greg@...ah.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v2 02/11] perf: core, add pmu register and lookup
	functions

On Wed, May 19, 2010 at 01:45:02AM +0000, Lin Ming wrote:
...
> +int perf_event_register_pmu(struct pmu *pmu)
> +{
> +	struct pmu *tmp;
> +	int ret = 1;
> +
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(tmp, &pmus, entry) {
> +		if (tmp->id == pmu->id) {
> +			ret = 0;
> +			goto err;

Hi Ming, is it supposed to get out in locked state?
I mean imbalanced rcu_read_lock somehow suspicicous ;)

> +		}
> +	}
> +	rcu_read_unlock();
> +
> +	spin_lock(&pmus_lock);
> +	list_add_tail_rcu(&pmu->entry, &pmus);
> +	spin_unlock(&pmus_lock);
> +
> +err:
> +	return ret;
> +}
> +
...

	-- Cyrill
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