linux-kernel - Re: [PATCH] mce: fix warning messages about static struct mce

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Message-ID: <20120117162850.GA19561@suse.de>
Date:	Tue, 17 Jan 2012 08:28:50 -0800
From:	Greg KH <gregkh@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Sergei Trofimovich <slyich@...il.com>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...64.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	prasad@...ux.vnet.ibm.com, Ming Lei <tom.leiming@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Andi Kleen <ak@...ux.intel.com>,
	gouders@...bocholt.fh-gelsenkirchen.de,
	Marcos Souza <marcos.mage@...il.com>, justinmattock@...il.com,
	Jeff Chua <jeff.chua.linux@...il.com>
Subject: Re: [PATCH] mce: fix warning messages about static struct mce_device

On Tue, Jan 17, 2012 at 07:51:25AM -0800, Greg KH wrote:
> On Tue, Jan 17, 2012 at 09:38:43AM +0100, Ingo Molnar wrote:
> > 
> > * Greg KH <gregkh@...e.de> wrote:
> > 
> > > diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
> > > index f35ce43..6aefb14 100644
> > > --- a/arch/x86/include/asm/mce.h
> > > +++ b/arch/x86/include/asm/mce.h
> > > @@ -151,7 +151,7 @@ static inline void enable_p5_mce(void) {}
> > >  
> > >  void mce_setup(struct mce *m);
> > >  void mce_log(struct mce *m);
> > > -DECLARE_PER_CPU(struct device, mce_device);
> > > +extern struct device *mce_device[CONFIG_NR_CPUS];
> > 
> > Minor nit, i don't think we have any other such [CONFIG_NR_CPUS] 
> > pattern in the kernel.
> > 
> > This should be something like:
> > 
> >   DECLARE_PER_CPU(struct device *, mce_device);
> 
> That is what we used to have, but with just a static struct device.  We
> really don't need this to be in the per-cpu area, a flat array should be
> just fine, why can't we use the CONFIG_NR_CPUS value?  Should we use
> something else?
> 
> > Or the pointer should be attached to the CPU info structure.
> 
> Ok, I have no objection to that, do you want me to make a patch doing
> that, now that this is already in Linus's tree?

Wait, isn't that variable also used in head.S, so do you really want a
struct device * in there?

thanks,

greg k-h
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