diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 284d1de..f130fa7 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -469,6 +469,8 @@ static void mce_report_event(struct pt_regs *regs)
 
 DEFINE_PER_CPU(unsigned, mce_poll_count);
 
+#define D printk("[%d] %s:%d\n", smp_processor_id(), __FILE__, __LINE__)
+
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -489,12 +491,21 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 	struct mce m;
 	int i;
 
+
+	printk("mcp on cpu %d flags %x banks %lx\n", smp_processor_id(),
+			flags, *b);
+
 	__get_cpu_var(mce_poll_count)++;
 
 	mce_setup(&m);
 
+	D;
+
 	m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
+
+	D;
 	for (i = 0; i < banks; i++) {
+		printk("bank %d\n", i);
 		if (!bank[i] || !test_bit(i, *b))
 			continue;
 
@@ -504,10 +515,12 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		m.tsc = 0;
 
 		barrier();
+		D;
 		m.status = mce_rdmsrl(MSR_IA32_MC0_STATUS + i*4);
 		if (!(m.status & MCI_STATUS_VAL))
 			continue;
 
+		D;
 		/*
 		 * Uncorrected or signalled events are handled by the exception
 		 * handler when it is enabled, so don't process those here.
@@ -518,11 +531,14 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		    (m.status & (mce_ser ? MCI_STATUS_S : MCI_STATUS_UC)))
 			continue;
 
+		D;
 		if (m.status & MCI_STATUS_MISCV)
 			m.misc = mce_rdmsrl(MSR_IA32_MC0_MISC + i*4);
 		if (m.status & MCI_STATUS_ADDRV)
 			m.addr = mce_rdmsrl(MSR_IA32_MC0_ADDR + i*4);
 
+		D;
+
 		if (!(flags & MCP_TIMESTAMP))
 			m.tsc = 0;
 		/*
@@ -534,6 +550,8 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 			add_taint(TAINT_MACHINE_CHECK);
 		}
 
+		D;
+
 		/*
 		 * Clear state for this bank.
 		 */
@@ -546,6 +564,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 	 */
 
 	sync_core();
+	printk("mcp on cpu %d finished\n", smp_processor_id());
 }
 EXPORT_SYMBOL_GPL(machine_check_poll);