linux-kernel - [PATCH RT] time/hrtimer: disable that mode check

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Date:   Wed, 13 Dec 2017 14:58:35 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-rt-users@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH RT] time/hrtimer: disable that mode check

On -RT we push all timers by default into the soft-mode. The
"start/update" code does not use that SOFT bit so we always see that
warning.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
I am going to fold it into the original patch since only v4.14 is
affected.

 kernel/time/hrtimer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 2fff8790bc56..f4df924d4b48 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -422,8 +422,10 @@ static inline void debug_hrtimer_activate(struct hrtimer *timer,
 	 * Check whether the HRTIMER_MODE_SOFT bit and hrtimer.is_soft
 	 * match, when a timer is started via__hrtimer_start_range_ns().
 	 */
+#ifndef CONFIG_PREEMPT_RT_BASE
 	if (modecheck)
-		WARN_ON_ONCE((mode & HRTIMER_MODE_SOFT) & !timer->is_soft);
+		WARN_ON_ONCE(!(mode & HRTIMER_MODE_SOFT) ^ !timer->is_soft);
+#endif
 
 	debug_object_activate(timer, &hrtimer_debug_descr);
 }
-- 
2.15.0