linux-kernel - Re: [RFC PATCH v1 13/70] x86, x2apic_cluster:

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Date:	Thu, 31 Jul 2014 03:52:34 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de,
	paulus@...ba.org, benh@...nel.crashing.org, tony.luck@...el.com,
	hpa@...or.com, jkosina@...e.cz, rafael.j.wysocki@...el.com,
	linux@....linux.org.uk, ralf@...ux-mips.org,
	schwidefsky@...ibm.com, davem@...emloft.net,
	viro@...iv.linux.org.uk, fweisbec@...il.com, cl@...ux.com,
	akpm@...ux-foundation.org, axboe@...nel.dk,
	JBottomley@...allels.com, neilb@...e.de,
	christoffer.dall@...aro.org, rostedt@...dmis.org, rric@...nel.org,
	gregkh@...uxfoundation.org, mhocko@...e.cz, david@...morbit.com
Subject: Re: [RFC PATCH v1 13/70] x86, x2apic_cluster: _FROZEN Cleanup

On Wed, Jul 30, 2014 at 10:48:52AM +0200, Borislav Petkov wrote:
> Date: Wed, 30 Jul 2014 10:48:52 +0200
> From: Borislav Petkov <bp@...en8.de>
> To: "Chen, Gong" <gong.chen@...ux.intel.com>
> Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de,
>  paulus@...ba.org, benh@...nel.crashing.org, tony.luck@...el.com,
>  hpa@...or.com, jkosina@...e.cz, rafael.j.wysocki@...el.com,
>  linux@....linux.org.uk, ralf@...ux-mips.org, schwidefsky@...ibm.com,
>  davem@...emloft.net, viro@...iv.linux.org.uk, fweisbec@...il.com,
>  cl@...ux.com, akpm@...ux-foundation.org, axboe@...nel.dk,
>  JBottomley@...allels.com, neilb@...e.de, christoffer.dall@...aro.org,
>  rostedt@...dmis.org, rric@...nel.org, gregkh@...uxfoundation.org,
>  mhocko@...e.cz, david@...morbit.com
> Subject: Re: [RFC PATCH v1 13/70] x86, x2apic_cluster: _FROZEN Cleanup
> User-Agent: Mutt/1.5.23 (2014-03-12)
> Well, look at the original code. What do you think happens if another
> _FROZEN action comes in which we don't handle in the switch-case?
> 
> Take a piece of paper and play it through slowly if you don't see it.
> Hint: err = 0.
> 
> > It looks like not quite comply with original logic. Once
> > new FROZEN logic is added, we have to update this code again. How
> > about using following code snippet:
> > 
> > +       if ((action & CPU_TASKS_FROZEN) &&
> > +           ((action & ~CPU_TASKS_FROZEN) == CPU_UP_CANCELED)) {
> > +               __update_clusterinfo(this_cpu);
> > +               return NOTIFY_OK;
> 
> No, this is different now from the original logic.
> 
I'm silly. You are right. I will use your patch directly(I should do
it at the beginning :-)).

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