linux-kernel - Re: [GIT PULL rcu/next] RCU commits for 3.1

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Message-ID: <1320685789.17809.30.camel@twins>
Date:	Mon, 07 Nov 2011 18:09:49 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Stephane Eranian <eranian@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	eric.dumazet@...il.com, shaohua.li@...el.com, ak@...ux.intel.com,
	mhocko@...e.cz, alex.shi@...el.com, efault@....de,
	linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>
Subject: Re: [GIT PULL rcu/next] RCU commits for 3.1

On Mon, 2011-11-07 at 08:56 -0800, Paul E. McKenney wrote:
> 
> If this really is a false positive, what should be used to get rid of
> the splats? 


Probably something slightly less horrid than the below.. ;-)

---

diff --git a/kernel/events/core.c b/kernel/events/core.c
index d1a1bee..8f05201 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -229,7 +229,7 @@ static void perf_ctx_unlock(struct perf_cpu_context *cpuctx,
 static inline struct perf_cgroup *
 perf_cgroup_from_task(struct task_struct *task)
 {
-	return container_of(task_subsys_state(task, perf_subsys_id),
+	return container_of(task_subsys_state_check(task, perf_subsys_id, 1),
 			struct perf_cgroup, css);
 }
 

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