linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Message-ID: <1339165390.2507.28.camel@laptop>
Date:	Fri, 08 Jun 2012 16:23:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, mingo@...e.hu, ming.m.lin@...el.com,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on
 SandyBridge

On Fri, 2012-06-08 at 16:07 +0200, Stephane Eranian wrote:
> > +extern struct blocking_notifier_head microcode_notifier;
> > +
> That is a problem because microcode can be compiled as a module.
> When I tried compiling your patch I got undefined for this notifier because
> I have microcode update as a module... 

Ah, no, setup.c needs an EXPORT_SYMBOL_GPL(microcode_notifier);. Then it
all builds again.

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