linux-kernel - RE: [patch x86/mce] ACPI, x86: Export boot_cpu_physical

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Date:	Thu, 14 Nov 2013 15:33:31 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	"Luck, Tony" <tony.luck@...el.com>
cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chen Gong <gong.chen@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [patch x86/mce] ACPI, x86: Export boot_cpu_physical_apicid to
 modules

On Thu, 14 Nov 2013, Luck, Tony wrote:

> > ERROR: "boot_cpu_physical_apicid" [drivers/acpi/acpi_extlog.ko] undefined!
> >
> > The symbol needs to be exported for it to be available.
> 
> Good - but I wonder how many more useless layers there are to this onion :-(
> 
> First I had to add a "#include <asm/cpu.h>"
> Then add the dependency on CONFIG_X86_LOCAL_APIC
> Now we need to export boot_cpu_physical_apicid
> 

asm/cpu.h itself is also indirectly relying on asm/topology.h to include 
asm/mpspec.h to get that declaration of boot_cpu_physical_apicid in the 
first place.

> all for the CONFIG_SMP=n case ... which I think is useless because there
> is no conceivable way anyone would run a uniprocessor kernel on a system
> that supports the extended error log. (Hint: multi-socket server multiplied by
> high-core-count processors multiplied by 2xHyperThread) is a number bigger
> than one).
> 
> Perhaps we should just have:
> 
> 	depends on SMP && X86_MCE
> 
> and stop the madness?
> 

Or do some randconfig testing before patches are proposed :)  I don't have 
any particular dependency on this, so I'm happy with whatever is decided.  
This is the last error I've found related to CONFIG_ACPI_EXTLOG, however.
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