linux-kernel - Re: [PATCH v2 x86 1/2] fix page faults by nmiaction in nmi if kmemcheck is enabled

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Date:	Tue, 06 Mar 2012 09:46:39 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org, paulus@...ba.org,
	mingo@...e.hu, acme@...stprotocols.net,
	Vegard Nossum <vegardno@....uio.no>,
	Don Zickus <dzickus@...hat.com>, tony.luck@...el.com,
	bp@...64.org, robert.richter@....com, lenb@...nel.org,
	minyard@....org, linux-edac@...r.kernel.org,
	oprofile-list@...ts.sf.net, linux-acpi@...r.kernel.org,
	openipmi-developer@...ts.sourceforge.net,
	linux-watchdog@...r.kernel.org, Thomas.Mingarelli@...com
Subject: Re: [PATCH v2 x86 1/2]  fix page faults by nmiaction in nmi if
 kmemcheck is enabled

On Mon, 2012-03-05 at 11:29 +0100, Wim Van Sebroeck wrote:
> Hi Li,
> 
> > diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> > index 8464ea1..e575e63 100644
> > --- a/drivers/watchdog/hpwdt.c
> > +++ b/drivers/watchdog/hpwdt.c
> > @@ -689,9 +689,22 @@ static void __devinit dmi_find_icru(const struct dmi_header *dm, void *dummy)
> >  	}
> >  }
> >  
> > +static struct nmiaction hpwdt_nmiaction[] = {
> > +	{
> > +		.handler	= hpwdt_pretimeout,
> > +		.name		= "hpwdt",
> > +	},
> > +	{
> > +		.handler	= hpwdt_pretimeout,
> > +		.flags		= NMI_FLAG_FIRST,
> > +		.name		= "hpwdt",
> > +	},
> > +};
> > +
> >  static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
> >  {
> >  	int retval;
> > +	struct nmiaction *na = hpwdt_nmiaction;
> >  
> >  	/*
> >  	 * On typical CRU-based systems we need to map that service in
> > @@ -733,9 +746,11 @@ static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
> >  	 * die notify list to handle a critical NMI. The default is to
> >  	 * be last so other users of the NMI signal can function.
> >  	 */
> > -	retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout,
> > -					(priority) ? NMI_FLAG_FIRST : 0,
> > -					"hpwdt");
> > +
> > +	if (priority)
> > +		na = &hpwdt_nmiaction[1];
> > +
> > +	retval = register_nmi_handler(NMI_UNKNOWN, na);
> >  	if (retval != 0) {
> >  		dev_warn(&dev->dev,
> >  			"Unable to register a die notifier (err=%d).\n",
> 
> Why not do something like;
> 
> static struct nmiaction hpwdt_nmiaction = {
> 	.handler	= hpwdt_pretimeout,
> 	.name		= "hpwdt",
> };
> 
> ...
> 	if (priority)
> 		hpwdt_nmiaction.flags = NMI_FLAG_FIRST;
> ...
> 

Thank you, Wim. I'll update it. 

Thanks,
Zhong

> Kind regards,
> Wim.
> 


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