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Re: [PATCH] x86: make clflush a required feature on x86_64

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From: Andi Kleen <andi@...>
To: Kyle McMartin <kyle@...>
Cc: <hpa@...>, <tglx@...>, <mingo@...>, <linux-kernel@...>
Subject: Re: [PATCH] x86: make clflush a required feature on x86_64
Date: Friday, January 18, 2008 - 1:53 am

Kyle McMartin <kyle@mcmartin.ca> writes:


The original required CPUID bit set for x86-64 came out of very
detailed discussions and thinking from AMD. I think they had good
reasons to chose the current set. I would only recommend to depart
from it for very good reasons and frankly you haven't given any.
You're talking about removing two instructions.

One problem that we had in the past is that some simulators
only implement the absolutely minimum feature set and you
might have well broken one of these with this.

-Andi
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Messages in current thread:
[PATCH] x86: make clflush a required feature on x86_64, Kyle McMartin, (Fri Jan 18, 12:59 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, Andi Kleen, (Fri Jan 18, 1:53 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, Kyle McMartin, (Fri Jan 18, 2:01 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, H. Peter Anvin, (Fri Jan 18, 2:27 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, Pavel Machek, (Fri Jan 11, 2:16 pm)
Re: [PATCH] x86: make clflush a required feature on x86_64, Andi Kleen, (Fri Jan 18, 2:54 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, H. Peter Anvin, (Fri Jan 18, 9:56 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, Andi Kleen, (Fri Jan 18, 10:18 am)
Re: [PATCH] x86: make clflush a required feature on x86_64, H. Peter Anvin, (Fri Jan 18, 1:04 am)
[PATCH] x86_64: remove redundant cpu_has_ definitions, Kyle McMartin, (Fri Jan 18, 1:25 am)
Re: [PATCH] x86_64: remove redundant cpu_has_ definitions, Ingo Molnar, (Fri Jan 18, 4:07 am)