7 files changed, 64 insertions, 37 deletions

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index 238468ae1993..c2e1ce33c7cb 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -6,6 +6,7 @@
 
 #include <linux/cpu.h>
 
+#include <asm/pat.h>
 #include <asm/processor.h>
 
 struct cpuid_bit {
@@ -48,3 +49,23 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
                         set_cpu_cap(c, cb->feature);
         }
 }
+
+#ifdef CONFIG_X86_PAT
+void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
+{
+        switch (c->x86_vendor) {
+        case X86_VENDOR_AMD:
+                if (c->x86 >= 0xf && c->x86 <= 0x11)
+                        return;
+                break;
+        case X86_VENDOR_INTEL:
+                if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+                        return;
+                break;
+        }
+
+        pat_disable(cpu_has_pat ?
+                    "PAT disabled. Not yet verified on this CPU type." :
+                    "PAT not supported by CPU.");
+}
+#endif
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 35b4f6a9c8ef..d0463a946247 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -12,6 +12,7 @@
 #include <asm/mmu_context.h>
 #include <asm/mtrr.h>
 #include <asm/mce.h>
+#include <asm/pat.h>
 #ifdef CONFIG_X86_LOCAL_APIC
 #include <asm/mpspec.h>
 #include <asm/apic.h>
@@ -308,19 +309,6 @@ 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;
-        }
-
 }
 
 /*
@@ -409,18 +397,6 @@ 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)
@@ -651,6 +627,7 @@ void __init early_cpu_init(void)
                 cpu_devs[cvdev->vendor] = cvdev->cpu_dev;
 
         early_cpu_detect();
+        validate_pat_support(&boot_cpu_data);
 }
 
 /* Make sure %fs is initialized properly in idle threads */
diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c
index 9dad6ca6cd70..e8edd63ab000 100644
--- a/arch/x86/kernel/geode_32.c
+++ b/arch/x86/kernel/geode_32.c
@@ -161,6 +161,25 @@ void geode_gpio_setup_event(unsigned int gpio, int pair, int pme)
 }
 EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
 
+int geode_has_vsa2(void)
+{
+        static int has_vsa2 = -1;
+
+        if (has_vsa2 == -1) {
+                /*
+                 * The VSA has virtual registers that we can query for a
+                 * signature.
+                 */
+                outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
+                outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
+
+                has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
+        }
+
+        return has_vsa2;
+}
+EXPORT_SYMBOL_GPL(geode_has_vsa2);
+
 static int __init geode_southbridge_init(void)
 {
         if (!is_geode())
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index db6839b53195..e03cc952f233 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -450,7 +450,6 @@ static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
 {
         struct task_struct *tsk = current;
 
-        clear_fpu(tsk);
         return __copy_from_user(&tsk->thread.xstate->fsave, buf,
                                 sizeof(struct i387_fsave_struct));
 }
@@ -461,7 +460,6 @@ static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
         struct user_i387_ia32_struct env;
         int err;
 
-        clear_fpu(tsk);
         err = __copy_from_user(&tsk->thread.xstate->fxsave, &buf->_fxsr_env[0],
                                sizeof(struct i387_fxsave_struct));
         /* mxcsr reserved bits must be masked to zero for security reasons */
@@ -478,6 +476,16 @@ int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
         int err;
 
         if (HAVE_HWFP) {
+                struct task_struct *tsk = current;
+
+                clear_fpu(tsk);
+
+                if (!used_math()) {
+                        err = init_fpu(tsk);
+                        if (err)
+                                return err;
+                }
+
                 if (cpu_has_fxsr)
                         err = restore_i387_fxsave(buf);
                 else
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index cc6f5eb20b24..c0c68c18a788 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -95,7 +95,7 @@ void __init setup_per_cpu_areas(void)
 
         /* Copy section for each CPU (we discard the original) */
         size = PERCPU_ENOUGH_ROOM;
-        printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
+        printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
                           size);
 
         for_each_possible_cpu(i) {
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 2283422af794..2c5f8b213e86 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -127,7 +127,12 @@ static struct resource standard_io_resources[] = { {
 }, {
         .name   = "keyboard",
         .start  = 0x0060,
-        .end    = 0x006f,
+        .end    = 0x0060,
+        .flags  = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+        .name   = "keyboard",
+        .start  = 0x0064,
+        .end    = 0x0064,
         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 }, {
         .name   = "dma page reg",
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 22c14e21c97c..f2fc8feb727d 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -70,6 +70,7 @@
 #include <asm/ds.h>
 #include <asm/topology.h>
 #include <asm/trampoline.h>
+#include <asm/pat.h>
 
 #include <mach_apic.h>
 #ifdef CONFIG_PARAVIRT
@@ -128,7 +129,9 @@ static struct resource standard_io_resources[] = {
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "timer1", .start = 0x50, .end = 0x53,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
-        { .name = "keyboard", .start = 0x60, .end = 0x6f,
+        { .name = "keyboard", .start = 0x60, .end = 0x60,
+                .flags = IORESOURCE_BUSY | IORESOURCE_IO },
+        { .name = "keyboard", .start = 0x64, .end = 0x64,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
@@ -1063,25 +1066,19 @@ 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;
         case X86_VENDOR_CENTAUR:
                 early_init_centaur(c);
                 break;
         }
 
+        validate_pat_support(c);
 }
 
 /*