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Date: Fri, 8 Jun 2012 16:26:37 +0200
Message-ID: <CABPqkBSfkoYyYZgbFwDL_wjLUB5d_9mAocuiAcV0bsgz4P8piw@mail.gmail.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge
From: Stephane Eranian <eranian@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, linux-kernel@vger.kernel.org,
        andi@firstfloor.org, mingo@elte.hu, ming.m.lin@intel.com,
        Andreas Herrmann <andreas.herrmann3@amd.com>,
        Borislav Petkov <borislav.petkov@amd.com>,
        Dimitri Sivanich <sivanich@sgi.com>,
        Dmitry Adamushko <dmitry.adamushko@gmail.com>
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On Fri, Jun 8, 2012 at 4:23 PM, Peter Zijlstra <peterz@infradead.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.