linux-kernel - Re: [PATCH] X86: cpu_debug support for VIA / Centaur CPU's

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Message-ID: <4A30340C.9030402@zytor.com>
Date:	Wed, 10 Jun 2009 15:30:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	lkml@...ethan.org
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...nel.org>,
	Harald Welte <HaraldWelte@...tech.com>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [PATCH] X86: cpu_debug support for VIA / Centaur CPU's

Michael S. Zick wrote:
>> yes, of course - i meant the /debug/x86/cpu/* behavior: it should 
>> either result zeroes, or should return -EINVAL. (probably the 
>> latter)
>>
> 
> Return zeroes - same as hardware case for bits which can't be set.
> Returning -EINVAL might match a specific bit pattern caller is looking for.
> 

It should be -EIO anyway, which is what /dev/cpu/*/msr does.

	-hpa
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