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

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Message-ID: <4FD8B3DA.5080802@zytor.com>
Date:	Wed, 13 Jun 2012 08:38:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <bp@...64.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, andi@...stfloor.org, mingo@...e.hu,
	ming.m.lin@...el.com, "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

On 06/13/2012 08:32 AM, Peter Zijlstra wrote:
> On Wed, 2012-06-13 at 06:59 -0700, H. Peter Anvin wrote:
>> On 06/13/2012 01:32 AM, Peter Zijlstra wrote:
>>> On Tue, 2012-06-12 at 21:49 +0200, Borislav Petkov wrote:
>>>>
>>>> But why, do you see a better option for how to tell the kernel to load a
>>>> binary blob early at boot? 
>>>
>>> built it in? There's this feature where you can included firmware blobs
>>> in the kernel image. It has all the benefits of initrd, since the only
>>> time I ever would update initrd if used it, would be when I install a
>>> new kernel, which I just built anyway.
>>>
>>
>> You know you can build in an initramfs blob in the kernel, right?  In
>> fact, there always is one there even if you don't create it explicitly.
> 
> Didn't know that..
> 
>> Problem solved, methinks.
> 
> Yep.
> 

We have to be a bit careful about it, though; the early initramfs
content can't be compressed.  It might end up making more sense to make
the builtin version of that a separate blob from the main builtin blob.

	-hpa
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