commit 9307cacad0dfe3749f00303125c6f7f0523e5616
author Yinghai Lu <yhlu.kernel.send@gmail.com> Mon Mar 24 23:24:34 2008 -0700
committer Ingo Molnar <mingo@elte.hu> Thu Apr 17 17:41:20 2008 +0200
tree bc28bf08dc18dacbb2654a9a368f4e09c580dfab
parent a7c7d0e91daebd7c5e51f9416d612b6a15e7e79a

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>

arch/x86/kernel/cpu/common.c

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 0dd87b8..d999d78 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -309,6 +309,19 @@
 
 	}
 
+	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 @@
 		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)

arch/x86/kernel/setup_64.c

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 2003449..c6fe1e4 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -962,12 +962,19 @@
 	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;
 	}
 

arch/x86/mm/pat.c

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 0648a22..72c0f60 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -40,19 +40,8 @@
 	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");