From: "H. Peter Anvin" <hpa@zytor.com>
To: lkml@morethan.org
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
Date: Wed, 10 Jun 2009 15:30:36 -0700 [thread overview]
Message-ID: <4A30340C.9030402@zytor.com> (raw)
In-Reply-To: <200906100611.14941.lkml@morethan.org>
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
next prev parent reply other threads:[~2009-06-10 22:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-09 8:29 [PATCH] X86: cpu_debug support for VIA / Centaur CPU's Harald Welte
2009-06-09 8:53 ` Jaswinder Singh Rajput
2009-06-09 14:53 ` Harald Welte
2009-06-09 15:15 ` Ingo Molnar
2009-06-10 4:23 ` H. Peter Anvin
2009-06-10 11:02 ` Ingo Molnar
2009-06-10 11:11 ` Michael S. Zick
2009-06-10 11:13 ` Ingo Molnar
2009-06-10 11:55 ` Michael S. Zick
2009-06-10 22:30 ` H. Peter Anvin [this message]
2009-06-09 15:18 ` Jaswinder Singh Rajput
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