linux-kernel - Re: [PATCH V2] tmp patch to fix hotplug issue in CMCI storm

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Date:	Mon, 18 Jun 2012 14:23:36 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Chen Gong <gong.chen@...ux.intel.com>
cc:	tony.luck@...el.com, borislav.petkov@....com, x86@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] tmp patch to fix hotplug issue in CMCI storm

On Mon, 18 Jun 2012, Chen Gong wrote:
> 于 2012/6/18 16:00, Thomas Gleixner 写道:
> > On Mon, 18 Jun 2012, Chen Gong wrote:
> > > index 92d8b5c..0493525 100644
> > > --- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
> > > +++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
> > > @@ -40,6 +40,7 @@ static DEFINE_RAW_SPINLOCK(cmci_discover_lock);
> > >   static DEFINE_PER_CPU(unsigned long, cmci_time_stamp);
> > >   static DEFINE_PER_CPU(unsigned int, cmci_storm_cnt);
> > >   static DEFINE_PER_CPU(unsigned int, cmci_storm_state);
> > > +static DEFINE_PER_CPU(unsigned long, cmci_storm_hcpu_status);
> > 
> > Why do you insist on having another status variable, which does
> > actually nothing than obfuscate the code?
> > 
> > Look at the usage sites:
> > 
> > >   		__this_cpu_write(cmci_storm_state, CMCI_STORM_SUBSIDED);
> > > +		__this_cpu_write(cmci_storm_hcpu_status,
> > > CMCI_STORM_HCPU_NONE);
> 
> Because here I can't substitute CMCI_STORM_HCPU_NONE with
> CMCI_STORM_SUBSIDED. If so, the status is chaos.

Have you actually read what I wrote later? You do not neeed that extra
state, period.