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

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Date:	Thu, 14 Nov 2013 23:26:21 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	David Rientjes <rientjes@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	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

> 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

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?

-Tony
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