linux-kernel - Re: Regression on cpufreq in v3.12-rc1

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Date:	Fri, 20 Sep 2013 09:49:21 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Regression on cpufreq in v3.12-rc1

On 19 September 2013 23:41, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> But there was no code to set the per-cpu values to -1 to begin with. Since
> the per-cpu variable was defined as static, it would have been initialized
> to zero. Thus, we would never actually hit the BUG_ON() condition, since
> policy_cpu didn't turn out to be -1.

Really!! Or I have turned blind (and there is very strong chance of that,
considering the amount of silly mistakes I do :) )...

I picked it up from 474deff7 only:

@@ -2148,10 +2125,8 @@ static int __init cpufreq_core_init(void)
        if (cpufreq_disabled())
                return -ENODEV;

-       for_each_possible_cpu(cpu) {
-               per_cpu(cpufreq_policy_cpu, cpu) = -1;
+       for_each_possible_cpu(cpu)
                init_rwsem(&per_cpu(cpu_policy_rwsem, cpu));
-       }

        cpufreq_global_kobject = kobject_create();
        BUG_ON(!cpufreq_global_kobject);
--
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