linux-kernel - Re: [PATCH v1] cpuidle-haltpoll: vcpu hotplug support

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Message-ID: <311c2ffe-f840-9990-c1a7-5561cc5a0f54@oracle.com>
Date:   Thu, 29 Aug 2019 15:24:31 +0100
From:   Joao Martins <joao.m.martins@...cle.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH v1] cpuidle-haltpoll: vcpu hotplug support

On 8/29/19 2:50 PM, Joao Martins wrote:
> On 8/29/19 12:56 PM, Marcelo Tosatti wrote:
>> Hi Joao,
>>
>> On Wed, Aug 28, 2019 at 07:56:50PM +0100, Joao Martins wrote:
>>> +static void haltpoll_uninit(void)
>>> +{
>>> +	unsigned int cpu;
>>> +
>>> +	cpus_read_lock();
>>> +
>>> +	for_each_online_cpu(cpu) {
>>> +		struct cpuidle_device *dev =
>>> +			per_cpu_ptr(haltpoll_cpuidle_devices, cpu);
>>> +
>>> +		if (!dev->registered)
>>> +			continue;
>>> +
>>> +		arch_haltpoll_disable(cpu);
>>> +		cpuidle_unregister_device(dev);
>>> +	}
>>
>> 1)
>>
>>> +
>>> +	cpuidle_unregister(&haltpoll_driver);
>>
>> cpuidle_unregister_driver.
> 
> Will fix -- this was an oversight.
> 
>>
>>> +	free_percpu(haltpoll_cpuidle_devices);
>>> +	haltpoll_cpuidle_devices = NULL;
>>> +
>>> +	cpus_read_unlock();
>>
>> Any reason you can't cpus_read_unlock() at 1) ?
>>
> No, let me adjust that too.
> 
>> Looks good otherwise.
>>

BTW, should I take this as a Acked-by, Reviewed-by, or neither? :)

	Joao