diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
index 65621fd..5c4cb21 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
@@ -553,8 +552,9 @@ static __cpuinit int threshold_create_device(unsigned int cpu)
 	unsigned int bank;
 	int err = 0;
 
+	printk(KERN_DEBUG "threshold_create_device: cpu %d, bank_map=%02x\n", cpu, per_cpu(bank_map,cpu));
 	for (bank = 0; bank < NR_BANKS; ++bank) {
-		if (!(per_cpu(bank_map, cpu) & 1 << bank))
+		if (!(per_cpu(bank_map, cpu) & (1 << bank)))
 			continue;
 		err = threshold_create_bank(cpu, bank);
 		if (err)
@@ -637,7 +637,7 @@ static void threshold_remove_device(unsigned int cpu)
 	unsigned int bank;
 
 	for (bank = 0; bank < NR_BANKS; ++bank) {
-		if (!(per_cpu(bank_map, cpu) & 1 << bank))
+		if (!(per_cpu(bank_map, cpu) & (1 << bank)))
 			continue;
 		threshold_remove_bank(cpu, bank);
 	}