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

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Date:	Tue, 20 May 2008 00:09:31 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	hpa@...or.com
Subject: [X86] Add recent Centaur CPUs to PAT whitelist

>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..638a3a6 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -62,6 +81,10 @@ 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))
+			set_cpu_cap(c, X86_FEATURE_PAT);
+		break;
 	}
 
 	pat_disable(cpu_has_pat ?
--
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