x86/nmi: Improve NMI duration console printouts

Convert the last remaining printk() in nmi.c to pr_info(). Along with
it, use timespec macros to calculate the NMI handler duration.

Signed-off-by: Sohil Mehta <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: sohilmeh

arch/x86/kernel/nmi.c

@@ -119,12 +119,12 @@ static void nmi_check_duration(struct nmiaction *action, u64 duration)
 
 	action->max_duration = duration;
 
-	remainder_ns = do_div(duration, (1000 * 1000));
-	decimal_msecs = remainder_ns / 1000;
+	/* Convert duration from nsec to msec */
+	remainder_ns = do_div(duration, NSEC_PER_MSEC);
+	decimal_msecs = remainder_ns / NSEC_PER_USEC;
 
-	printk_ratelimited(KERN_INFO
-		"INFO: NMI handler (%ps) took too long to run: %lld.%03d msecs\n",
-		action->handler, duration, decimal_msecs);
+	pr_info_ratelimited("INFO: NMI handler (%ps) took too long to run: %lld.%03d msecs\n",
+			    action->handler, duration, decimal_msecs);
 }
 
 static int nmi_handle(unsigned int type, struct pt_regs *regs)