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

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Message-ID: <20190829144011.GA14365@amt.cnet>
Date:   Thu, 29 Aug 2019 11:40:14 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Joao Martins <joao.m.martins@...cle.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 Thu, Aug 29, 2019 at 03:24:31PM +0100, Joao Martins wrote:
> 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

I'll ACK -v2 once you send it.