linux-kernel - Re: [v5 RFC PATCH 0/7]: cpuidle/x86/POWER (REDESIGN): Cleanup idle power management code in x86, cleanup drivers/cpuidle/cpuidle.c and introduce cpuidle to POWER.

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Message-ID: <20090922085644.GA5511@linux.vnet.ibm.com>
Date:	Tue, 22 Sep 2009 14:26:44 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Joel Schopp <jschopp@...tin.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Arun Bharadwaj <arun@...ux.vnet.ibm.com>
Subject: Re: [v5 RFC PATCH 0/7]: cpuidle/x86/POWER (REDESIGN): Cleanup idle
	power management code in x86, cleanup drivers/cpuidle/cpuidle.c and
	introduce cpuidle to POWER.

* Peter Zijlstra <a.p.zijlstra@...llo.nl> [2009-09-22 09:25:59]:

> 
> 
> Much better :-)
> 
> 
> But I'm puzzled by all the per-cpu-ish-ness of the stuff. Why would you
> need to register things on a per-cpu basis?
> 
> Also:
> 
> 
> +       list_for_each(pos, &per_cpu(cpuidle_devices_list, cpu)) {
> +               temp_dev = container_of(pos, struct cpuidle_device,
> +                                       percpu_list[cpu]);
> +               if (dev == temp_dev) {
> +                       list_del(&temp_dev->percpu_list[cpu]);
> +                       cpuidle_remove_state_sysfs(temp_dev);
> +               }
> +       }
> 
> Looks buggy, either you want to break out of the loop on dev ==
> temp_dev, or you want to use list_for_each_safe().
> 
> 
> 

Hi Peter,

There were a couple of buggy issues, which i have cleaned up for the
next iteration.

        * As you pointed out above, the loop is buggy.
        * Also, the percpu_list[NR_CPUS] which i am defining inside
          struct cpuidle_device is wrong. It does not need to be an
          array.

Thanks for the quick turnaround
arun
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