#define MSR_IA32_THERM_CONTROL         0x0000019a
 #define MSR_IA32_THERM_INTERRUPT       0x0000019b
+
+#define THERM_INT_LOW_ENABLE           (1 << 0)
+#define THERM_INT_HIGH_ENABLE          (1 << 1)
+
 #define MSR_IA32_THERM_STATUS          0x0000019c
+
+#define THERM_STATUS_PROCHOT           (1 << 0)
+
 #define MSR_IA32_MISC_ENABLE           0x000001a0
 
 /* MISC_ENABLE bits: architectural */
 
         */
        rdmsr(MSR_IA32_MISC_ENABLE, l, h);
        h = apic_read(APIC_LVTTHMR);
-       if ((l & (1 << 3)) && (h & APIC_DM_SMI)) {
+       if ((l & MSR_IA32_MISC_ENABLE_TM1) && (h & APIC_DM_SMI)) {
                printk(KERN_DEBUG
                       "CPU%d: Thermal monitoring handled by SMI\n", cpu);
                return;
        }
 
-       if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
+       if (cpu_has(c, X86_FEATURE_TM2) && (l & MSR_IA32_MISC_ENABLE_TM2))
                tm2 = 1;
 
        /* Check whether a vector already exists */
        apic_write(APIC_LVTTHMR, h);
 
        rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
-       wrmsr(MSR_IA32_THERM_INTERRUPT, l | 0x03, h);
+       wrmsr(MSR_IA32_THERM_INTERRUPT,
+               l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
 
        intel_set_thermal_handler();
 
        rdmsr(MSR_IA32_MISC_ENABLE, l, h);
-       wrmsr(MSR_IA32_MISC_ENABLE, l | (1 << 3), h);
+       wrmsr(MSR_IA32_MISC_ENABLE, l | MSR_IA32_MISC_ENABLE_TM1, h);
 
        /* Unmask the thermal vector: */
        l = apic_read(APIC_LVTTHMR);
 
        irq_enter();
 
        rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
-       if (therm_throt_process(msr_val & 1))
+       if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT))
                mce_log_therm_throt_event(msr_val);
 
        inc_irq_stat(irq_thermal_count);