linux-kernel - Re: [PATCH] x86 debugctl MSR access interface

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Message-ID: <20081110055835.GD3139@in.ibm.com>
Date:	Mon, 10 Nov 2008 11:28:35 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	eranian@...il.com
Cc:	linux-kernel@...r.kernel.org, anil.s.keshavamurthy@...el.com,
	davem@...emloft.net,
	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH] x86 debugctl MSR access interface

On Fri, Nov 07, 2008 at 03:44:09PM +0100, stephane eranian wrote:
> Hello,
> 
> On Intel X86 processors, the DEBUGCTL msr contains lots of bits
> to control various unrelated features, such as LBR, BTS, PMU.
> 
> Nowadays, several subsystems need access to this MSR to set or
> clear the bits they care about. In 2.6.27, the new DS/BTS interface
> was introduced and DEBUGCTL can now be cleared and restored
> on context switches.
> 
> The KPROBE interface also uses DEBUGCTL.

Stephane,

I see no problems with the kprobes part of the patch.

Ananth
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