posix-timers: give lazy compilers some help optimizing code away

The OpenRISC compiler (so far) fails to optimize away a large portion of code containing a reference to posix_timer_event in alarmtimer.c when CONFIG_POSIX_TIMERS is unset. Let's give it a direct clue to let the build succeed. This fixes [linux-next:master 6682/7183] alarmtimer.c:undefined reference to `posix_timer_event' reported by kbuild test robot. Signed-off-by: Nicolas Pitre <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Josh Triplett <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
ambv · Dec 15, 2016 · b6f8a92 · b6f8a92
1 parent 63980c8
commit b6f8a92
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
@@ -516,7 +516,8 @@ static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
 
 	spin_lock_irqsave(&ptr->it_lock, flags);
 	if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) {
-		if (posix_timer_event(ptr, 0) != 0)
+		if (IS_ENABLED(CONFIG_POSIX_TIMERS) &&
+		    posix_timer_event(ptr, 0) != 0)
 			ptr->it_overrun++;
 	}