perf: Remove pointless breakpoint union

Remove pointless union in the breakpoint field of hw_perf_event.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>

include/linux/perf_event.h

@@ -487,9 +487,8 @@ struct hw_perf_event {
 			struct hrtimer	hrtimer;
 		};
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
-		union { /* breakpoint */
-			struct arch_hw_breakpoint	info;
-		};
+		/* breakpoint */
+		struct arch_hw_breakpoint	info;
 #endif
 	};
 	atomic64_t			prev_count;

lib/Kconfig.debug

@@ -520,11 +520,13 @@ config LOCK_STAT
 
 	 For more details, see Documentation/lockstat.txt
 
-	 You can analyze lock events with "perf lock", subcommand of perf.
-	 If you want to use "perf lock", you need to turn on CONFIG_EVENT_TRACING.
+	 This also enables lock events required by "perf lock",
+	 subcommand of perf.
+	 If you want to use "perf lock", you also need to turn on
+	 CONFIG_EVENT_TRACING.
 
 	 CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
- 	 (CONFIG_LOCKDEP defines "acquire" and "release" events.)
+	 (CONFIG_LOCKDEP defines "acquire" and "release" events.)
 
 config DEBUG_LOCKDEP
 	bool "Lock dependency engine debugging"