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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 <nico@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Josh Triplett <josh@joshtriplett.org>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Pitre 2016-12-14 15:06:13 -08:00 committed by Linus Torvalds
parent 63980c80e1
commit b6f8a92c9c
1 changed files with 2 additions and 1 deletions
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3
kernel/time/alarmtimer.c
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@ -516,7 +516,8 @@ static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
spin_lock_irqsave(&ptr->it_lock, flags); spin_lock_irqsave(&ptr->it_lock, flags);
if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) { 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++; ptr->it_overrun++;
} }