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

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Date:	Mon, 31 Dec 2007 00:06:20 +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 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?

> > > -void __cpuinit setup_local_APIC (void)
> >
> > does not mix well with an __init call:
> >
> > > +void __init enable_IO_APIC(void)
> >
> > and you hack it around by using a function pointer. Nasty and still
> > buggy. The proper solution would be to mark enable_IO_APIC as __cpuinit
> > too (or something like that).
> 
> after change that to __cpuinit, i got
> 
> WARNING: vmlinux.o(.text+0x17f84): Section mismatch: reference to
> .init.text: (between 'enable_IO_APIC' and 'ioapic_resume')
> WARNING: vmlinux.o(.text+0x17f92): Section mismatch: reference to
> .init.text: (between 'enable_IO_APIC' and 'ioapic_resume')

find_isa_irq_{apic,pin} are called by enable_IO_APIC() and therefore 
also have to be changed from __init to __cpuinit.

> YH

cu
Adrian

BTW: Is there a reason why your patch doesn't touch the 32bit code?

-- 

       "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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