linux-kernel - x86: enable pat on amd athlon mode=6

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Message-Id: <200806252153.35675.bernd-schubert@gmx.de>
Date:	Wed, 25 Jun 2008 21:53:35 +0200
From:	Bernd Schubert <bernd-schubert@....de>
To:	linux-kernel@...r.kernel.org
Subject: x86: enable pat on amd athlon mode=6

Hello,

on my AthlonXP 1700 PAT works fine (I tested it several days). Please accept one of the patches below, I don't know which you refer.


Signed-off-by: Bernd Schubert <bernd-schubert@....de>

Patch to enable PAT specifically on model=6

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index c2e1ce3..61a5aa5 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -57,6 +57,8 @@ void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
 	case X86_VENDOR_AMD:
 		if (c->x86 >= 0xf && c->x86 <= 0x11)
 			return;
+		if (c->x86 == 0x6)
+			return;
 		break;
 	case X86_VENDOR_INTEL:
 		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))


Or maybe PAT on all system >=6 is suitable?


diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index c2e1ce3..f12c413 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -55,7 +55,7 @@ void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
 {
 	switch (c->x86_vendor) {
 	case X86_VENDOR_AMD:
-		if (c->x86 >= 0xf && c->x86 <= 0x11)
+		if (c->x86 >= 0x6 && c->x86 <= 0x11)
 			return;
 		break;
 	case X86_VENDOR_INTEL:


Thanks,
Bernd
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