Message-ID: <4A30340C.9030402@zytor.com>
Date: Wed, 10 Jun 2009 15:30:36 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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CC: Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@kernel.org>,
       Harald Welte <HaraldWelte@viatech.com>,
       Jaswinder Singh Rajput <jaswinder@kernel.org>,
       linux-kernel@vger.kernel.org, tglx@linutronix.de
Subject: Re: [PATCH] X86: cpu_debug support for VIA / Centaur CPU's
References: <20090609082931.GD25316@prithivi.gnumonks.org> <4A2F353A.9040007@kernel.org> <20090610110244.GE27724@elte.hu> <200906100611.14941.lkml@morethan.org>
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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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