rcu: Trace expedited grace-period numbers in hexadecimal

This commit reformats the expedited grace-period numbers into hexadecimal
for easier decoding and comparison.  The normal grace-period numbers
remain in decimal for the time being.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

include/trace/events/rcu.h

@@ -207,7 +207,7 @@ TRACE_EVENT_RCU(rcu_exp_grace_period,
 		__entry->gpevent = gpevent;
 	),
 
-	TP_printk("%s %ld %s",
+	TP_printk("%s %#lx %s",
 		  __entry->rcuname, __entry->gpseq, __entry->gpevent)
 );