linux-kernel - The msr_safe functions and returning -EFAULT

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Message-ID: <4A9AE998.4040201@zytor.com>
Date:	Sun, 30 Aug 2009 14:05:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Avi Kivity <avi@...ranet.com>
Subject: The msr_safe functions and returning -EFAULT

Right now, the *msr_safe() functions are returning -EFAULT.  As far as I
can tell, this makes absolutely no sense -- EFAULT is a nonsensical
error (it means a pointer into user memory given to a system call is
invalid), and the only user that seems to use this as anything other
than a boolean is the MSR driver, which wants EIO.

Sending out an email in case I have missed any instances, but I'm
inclined to just change this to EIO globally.

Anyone has objections?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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