From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>,
David Fries <david@fries.net>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Fix i486 suspend to disk CR4 oops
Date: Sun, 17 Aug 2008 23:34:50 -0700 [thread overview]
Message-ID: <48A9180A.8020803@zytor.com> (raw)
In-Reply-To: <87skt2270c.fsf@basil.nowhere.org>
Andi Kleen wrote:
>>>
>> The other alternative is to probe for the CPUID instruction (via
>> EFLAGS.ID) -- CR4 is present if and only if CPUID exists.
>
> Can be already checked for with boot_cpu_data.extended_cpuid_level.
>
I believe you mean just plain cpuid_level (which is set to -1 if CPUID
doesn't exist.) extended_cpuid_level is only defined on x86-64, but all
x86-64 CPUs have CR4.
-hpa
next prev parent reply other threads:[~2008-08-18 6:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-18 4:03 [PATCH] Fix i486 suspend to disk CR4 oops David Fries
2008-08-18 4:14 ` Maciej W. Rozycki
2008-08-18 4:35 ` H. Peter Anvin
2008-08-18 6:04 ` Andi Kleen
2008-08-18 6:34 ` H. Peter Anvin [this message]
2008-08-18 6:42 ` Andi Kleen
2008-08-18 6:41 ` Ingo Molnar
2008-08-18 6:45 ` H. Peter Anvin
2008-08-18 9:15 ` Pavel Machek
2008-08-18 10:16 ` Rafael J. Wysocki
2008-08-18 12:58 ` David Fries
2008-08-18 13:25 ` Ingo Molnar
2008-08-18 14:41 ` Maciej W. Rozycki
2008-08-18 14:38 ` Maciej W. Rozycki
2008-08-18 22:04 ` Pavel Machek
2008-08-18 22:10 ` H. Peter Anvin
2008-08-18 15:24 ` Dave Jones
2008-08-18 16:04 ` Lennart Sorensen
2008-08-18 17:17 ` Dave Jones
2008-08-18 17:32 ` H. Peter Anvin
2008-08-18 22:02 ` Pavel Machek
2008-08-19 3:37 ` [PATCH] i486 CR4 oops, no_console_suspend David Fries
2008-08-19 9:34 ` Ingo Molnar
2008-08-19 16:07 ` H. Peter Anvin
2008-08-21 4:17 ` David Fries
2008-08-21 5:37 ` H. Peter Anvin
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