From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Lin Ming <ming.m.lin@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Paul Mundt <lethal@linux-sh.org>,
"eranian@gmail.com" <eranian@gmail.com>,
"Gary.Mohr@Bull.com" <Gary.Mohr@bull.com>,
"arjan@linux.intel.com" <arjan@linux.intel.com>,
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
Paul Mackerras <paulus@samba.org>,
"David S. Miller" <davem@davemloft.net>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Will Deacon <will.deacon@arm.com>,
Maynard Johnson <mpjohn@us.ibm.com>, Carl Love <carll@us.ibm.com>,
"greg@kroah.com" <greg@kroah.com>,
Kay Sievers <kay.sievers@vrfy.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH v2 02/11] perf: core, add pmu register and lookup functions
Date: Tue, 18 May 2010 22:38:58 +0400 [thread overview]
Message-ID: <20100518183858.GE5081@lenovo> (raw)
In-Reply-To: <1274233502.3036.80.camel@localhost>
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
next prev parent reply other threads:[~2010-05-18 18:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-19 1:45 [RFC][PATCH v2 02/11] perf: core, add pmu register and lookup functions Lin Ming
2010-05-18 18:38 ` Cyrill Gorcunov [this message]
2010-05-19 2:00 ` Lin Ming
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