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

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Message-ID: <CABPqkBSfkoYyYZgbFwDL_wjLUB5d_9mAocuiAcV0bsgz4P8piw@mail.gmail.com>
Date:	Fri, 8 Jun 2012 16:26:37 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Jun 8, 2012 at 4:23 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 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.
>

Yes, it works with this now!
Thanks.
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