1 files changed, 38 insertions, 2 deletions

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 25c559ba8d54..7437fa133c02 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -4,6 +4,7 @@
 #include <linux/string.h>
 #include <linux/bitops.h>
 #include <linux/smp.h>
+#include <linux/sched.h>
 #include <linux/thread_info.h>
 #include <linux/module.h>
 
@@ -13,6 +14,7 @@
 #include <asm/uaccess.h>
 #include <asm/ds.h>
 #include <asm/bugs.h>
+#include <asm/cpu.h>
 
 #ifdef CONFIG_X86_64
 #include <asm/topology.h>
@@ -53,13 +55,23 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
                 c->x86_cache_alignment = 128;
 #endif
 
+        /* CPUID workaround for 0F33/0F34 CPU */
+        if (c->x86 == 0xF && c->x86_model == 0x3
+            && (c->x86_mask == 0x3 || c->x86_mask == 0x4))
+                c->x86_phys_bits = 36;
+
         /*
          * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
-         * with P/T states and does not stop in deep C-states
+         * with P/T states and does not stop in deep C-states.
+         *
+         * It is also reliable across cores and sockets. (but not across
+         * cabinets - we turn it off in that case explicitly.)
          */
         if (c->x86_power & (1 << 8)) {
                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
                 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
+                set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
+                sched_clock_stable = 1;
         }
 
         /*
@@ -110,6 +122,28 @@ static void __cpuinit trap_init_f00f_bug(void)
 }
 #endif
 
+static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
+{
+#ifdef CONFIG_SMP
+        /* calling is from identify_secondary_cpu() ? */
+        if (c->cpu_index == boot_cpu_id)
+                return;
+
+        /*
+         * Mask B, Pentium, but not Pentium MMX
+         */
+        if (c->x86 == 5 &&
+            c->x86_mask >= 1 && c->x86_mask <= 4 &&
+            c->x86_model <= 3) {
+                /*
+                 * Remember we have B step Pentia with bugs
+                 */
+                WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
+                                    "with B stepping processors.\n");
+        }
+#endif
+}
+
 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 {
         unsigned long lo, hi;
@@ -186,6 +220,8 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 #ifdef CONFIG_X86_NUMAQ
         numaq_tsc_disable();
 #endif
+
+        intel_smp_check(c);
 }
 #else
 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
@@ -385,7 +421,7 @@ static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned i
 }
 #endif
 
-static struct cpu_dev intel_cpu_dev __cpuinitdata = {
+static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
         .c_vendor       = "Intel",
         .c_ident        = { "GenuineIntel" },
 #ifdef CONFIG_X86_32