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Re: [PATCH] x86: pat cpu feature bit setting for known cpus

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From: Venki Pallipadi <venkatesh.pallipadi@...>
To: Yinghai Lu <yhlu.kernel@...>
Cc: H. Peter Anvin <hpa@...>, Pallipadi, Venkatesh <venkatesh.pallipadi@...>, Ingo Molnar <mingo@...>, Thomas Gleixner <tglx@...>, Andrew Morton <akpm@...>, kernel list <linux-kernel@...>, <suresh.b.siddha@...>
Subject: Re: [PATCH] x86: pat cpu feature bit setting for known cpus
Date: Tuesday, March 25, 2008 - 3:08 pm

On Tue, Mar 25, 2008 at 11:03:37AM -0700, Yinghai Lu wrote:

Main reason for white-list at this point is not to be side-tracked by
real or potential erratas on older CPUs. Focussing on getting the support for
this feature on current and future CPUs. If older CPUs have survived all these
days without this feature, they should be doing OK.

Other reason being the amount of testing we get on those older systems. I mean,
any regression on some specific CPU is hard to find unless it is being tested
or someone audits all the errata documents to prepare the blacklist (Unless
we want to have big blacklist which is just !current_whitelist). We do not
have any self test that can detect and report any problematic CPUs that we
can add to the blacklist.

Having said that, if there is a need for this on older CPUs, I am OK with
having this as a blacklist.
 
Thanks,
Venki

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Messages in current thread:
[PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Tue Mar 25, 2:24 am)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, dean gaudet, (Sun Mar 30, 7:43 am)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Pavel Machek, (Fri Mar 28, 9:41 am)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Fri Mar 28, 10:51 am)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, H. Peter Anvin, (Tue Mar 25, 9:38 am)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Tue Mar 25, 2:03 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Venki Pallipadi, (Tue Mar 25, 3:08 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Ingo Molnar, (Tue Mar 25, 4:08 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, H. Peter Anvin, (Tue Mar 25, 4:38 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, H. Peter Anvin, (Tue Mar 25, 7:01 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Tue Mar 25, 7:05 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, H. Peter Anvin, (Tue Mar 25, 7:06 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Tue Mar 25, 7:08 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, H. Peter Anvin, (Tue Mar 25, 8:10 pm)
RE: [PATCH] x86: pat cpu feature bit setting for known cpus, Pallipadi, Venkatesh, (Tue Mar 25, 7:38 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Yinghai Lu, (Tue Mar 25, 8:01 pm)
Re: [PATCH] x86: pat cpu feature bit setting for known cpus, Ingo Molnar, (Tue Mar 25, 6:58 am)