linux-kernel - Re: [PATCH] x86_64: clear IO_APIC before enabing apic error vector. v2

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Message-ID: <20071230232354.GA3083@does.not.exist>
Date:	Mon, 31 Dec 2007 01:23:54 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: clear IO_APIC before enabing apic error
	vector. v2

On Sun, Dec 30, 2007 at 02:42:41PM -0800, Yinghai Lu wrote:
> On Dec 30, 2007 2:06 PM, Adrian Bunk <bunk@...nel.org> wrote:
> > On Sun, Dec 30, 2007 at 12:48:48PM -0800, Yinghai Lu wrote:
> > > On Dec 30, 2007 6:51 AM, Ingo Molnar <mingo@...e.hu> wrote:
> > > >
> > > > * Yinghai Lu <Yinghai.Lu@....COM> wrote:
> > > >
> > > > > please check if you can replace the one in the x86-mm
> > > > >
> > > > > http://git.kernel.org/?p=linux/kernel/git/x86/linux-2.6-x86.git;a=commitdiff;h=ffcbdc220a1520d006a837f33589c7c19ffbeb76
> > > > >
> > > > > the updated one avoid one link warning.
> > > >
> > > > please send delta patches instead - so that we can review the changes.
> > >
> > > will do that in another patch.
> > >
> > > >
> > > > > this is the updated verison that take enable_IO_APIC as extra call for
> > > > > setup_local_APIC to avoid linking warning.
> > > >
> > > > hm, what link warning did you get? Perhaps the following __cpuinit:
> > >
> > > WARNING: vmlinux.o(.text+0x163d5): Section mismatch: reference to
> > > .init.text:enable_IO_APIC (between 'setup_local_APIC' and
> > > 'apic_is_clustered_box')
> >
> > So you are doing complicated things for silencing the warning (there is
> > an easier ways for achieving it), but the real bug that you will get an
> > Oops when calling enable_IO_APIC() after bootup since it already got
> > freed stays?
> 
> the enable_IO_APIC is actually doing clear_IO_APIC. and it is only
> called by BSP via setup_local_APIC
> and it is not called again after bootup

OK, this was a bit hidden inside your pointer games.

Please send a patch that ignores the warning (and therefore doesn't do 
these pointer games), and I'll fix the warning in a followup patch.

> YH

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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