linux-kernel - Re: [RFC] new MSR r/w functions per CPU

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Message-ID: <4580827F.8080703@zytor.com>
Date:	Wed, 13 Dec 2006 14:45:19 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Jones <davej@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Rudolf Marek <r.marek@...embler.cz>, norsk5@...ssion.com,
	lkml <linux-kernel@...r.kernel.org>,
	LM Sensors <lm-sensors@...sensors.org>,
	bluesmoke-devel@...ts.sourceforge.net
Subject: Re: [RFC] new MSR r/w functions per CPU

Dave Jones wrote:
> 
> Can you explain this a little further? I'm fairly certain
> there are places in the kernel already doing this (or similar).
> In fact, I cut-n-pasted most of the above from similar code in the
> powernow-k8 driver.  What exactly can we deadlock on?
> 

I wanted to change the MSR driver to do the above, and Alan Cox objected 
that with realtime priority routines and/or user set affinity, that code 
might never be executed, so I retained the IPI-based code (which 
executes at the target processor at interrupt priority.)

	-hpa
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