From: Yinghai Lu <yhlu.kernel.send@gmail.com>
Date: Tue, 25 Mar 2008 06:24:34 +0000 (-0700)
Subject: x86: pat cpu feature bit setting for known cpus
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=9307cacad0dfe3749f00303125c6f7f0523e5616;p=openwrt%2Fstaging%2Fblogic.git

x86: pat cpu feature bit setting for known cpus

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 0dd87b8d6707..d999d7833bc2 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -309,6 +309,19 @@ static void __cpuinit early_get_cap(struct cpuinfo_x86 *c)
 
 	}
 
+	clear_cpu_cap(c, X86_FEATURE_PAT);
+
+	switch (c->x86_vendor) {
+	case X86_VENDOR_AMD:
+		if (c->x86 >= 0xf && c->x86 <= 0x11)
+			set_cpu_cap(c, X86_FEATURE_PAT);
+		break;
+	case X86_VENDOR_INTEL:
+		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+			set_cpu_cap(c, X86_FEATURE_PAT);
+		break;
+	}
+
 }
 
 /*
@@ -397,6 +410,18 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
 		init_scattered_cpuid_features(c);
 	}
 
+	clear_cpu_cap(c, X86_FEATURE_PAT);
+
+	switch (c->x86_vendor) {
+	case X86_VENDOR_AMD:
+		if (c->x86 >= 0xf && c->x86 <= 0x11)
+			set_cpu_cap(c, X86_FEATURE_PAT);
+		break;
+	case X86_VENDOR_INTEL:
+		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+			set_cpu_cap(c, X86_FEATURE_PAT);
+		break;
+	}
 }
 
 static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 20034493b5ad..c6fe1e4bc7c2 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -962,12 +962,19 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 	if (c->extended_cpuid_level >= 0x80000007)
 		c->x86_power = cpuid_edx(0x80000007);
 
+
+	clear_cpu_cap(c, X86_FEATURE_PAT);
+
 	switch (c->x86_vendor) {
 	case X86_VENDOR_AMD:
 		early_init_amd(c);
+		if (c->x86 >= 0xf && c->x86 <= 0x11)
+			set_cpu_cap(c, X86_FEATURE_PAT);
 		break;
 	case X86_VENDOR_INTEL:
 		early_init_intel(c);
+		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+			set_cpu_cap(c, X86_FEATURE_PAT);
 		break;
 	}
 
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 0648a2225b09..72c0f6097402 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -40,19 +40,8 @@ static int pat_known_cpu(void)
 	if (!pat_wc_enabled)
 		return 0;
 
-	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
-	    (boot_cpu_data.x86 == 0xF ||
-	     (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model >= 15))) {
-		if (cpu_has_pat) {
-			return 1;
-		}
-	}
-	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
-	     boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) {
-		if (cpu_has_pat) {
-			return 1;
-		}
-	}
+	if (cpu_has_pat)
+		return 1;
 
 	pat_wc_enabled = 0;
 	printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");