linux-kernel - Re: [X86] Add recent Centaur CPUs to PAT whitelist

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Message-ID: <20080520131943.GA4843@redhat.com>
Date:	Tue, 20 May 2008 09:19:43 -0400
From:	Dave Jones <davej@...hat.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com
Subject: Re: [X86] Add recent Centaur CPUs to PAT whitelist

On Mon, May 19, 2008 at 10:49:28PM -0700, Yinghai Lu wrote:

 > > +       case X86_VENDOR_CENTAUR:
 > > +               if ((c->x86 > 6) || (c->x86 == 6 && c->x86_model >= 10))
 > > +                       set_cpu_cap(c, X86_FEATURE_PAT);
 > > +               break;
 > >        }
 > >
 > >        pat_disable(cpu_has_pat ?
 > 
 > you may need to return early...

Argh, old version of the patch.  This one should be right.

	Dave

---


>From conversation with Centaur engineers, both the newer generations
of the VIA C7, and their future CPUs support PAT, with no known errata.

Signed-off-by: Dave Jones <davej@...hat.com>

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index c2e1ce3..b9f14f9 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -62,6 +62,10 @@ void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
 		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
 			return;
 		break;
+	case X86_VENDOR_CENTAUR:
+		if ((c->x86 > 6) || (c->x86 == 6 && c->x86_model >= 10))
+			return;
+		break;
 	}
 
 	pat_disable(cpu_has_pat ?


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