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Date: Thu, 07 Jul 2016 17:03:19 +0100
From: James Morse <james.morse@arm.com>
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To: "Chen, Yu C" <yu.c.chen@intel.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>
CC: "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
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        Len Brown <lenb@kernel.org>, "x86@kernel.org" <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][RFC v3] x86, hotplug: Use hlt instead of mwait if invoked
 from disable_nonboot_cpus
References: <1467105403-5085-1-git-send-email-yu.c.chen@intel.com> <209704957.TWElLMTLfP@vostro.rjw.lan> <36DF59CE26D8EE47B0655C516E9CE6402877EBB4@shsmsx102.ccr.corp.intel.com>
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Hi,

On 07/07/16 03:50, Chen, Yu C wrote:
>> From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
>> Below is my sort of version of this (untested) and I did it this way, because the
>> issue is specific to resume from hibernation (the workaround need not be
>> applied anywhere else) and the hibernate_resume_nonboot_cpu_disable()
>> thing may be useful to arm64 too if I'm not mistaken (James?).
> 
> James might want a flag to distinguish whether it is from suspend or resume,
> in his arch-specific disabled_nonboot_cpus?

That isn't serious, we can work out whether it is hibernate/resume based on
whether we've read data out of the the arch header. I added it in the other
series as it looked cleaner to pass the value in instead of inferring it.


Thanks,

James