[patch 05/12] perf/core: Mark hrtimers to expire in hard interrupt context

[Thomas Gleixner]

From: Thomas Gleixner <t...@linutronix.de>

To guarantee that the multiplexing mechanism and the hrtimer driven events
work on PREEMPT_RT enabled kernels it's required that the related hrtimers
expire in hard interrupt context. Mark them so PREEMPT_RT kernels wont
defer them to soft interrupt context.

No functional change.

[ tglx: Split out of larger combo patch. Added changelog ]

Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
---
 kernel/events/core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1103,7 +1103,7 @@ static void __perf_mux_hrtimer_init(stru
        cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * interval);
 
        raw_spin_lock_init(&cpuctx->hrtimer_lock);
-       hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
+       hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED_HARD);
        timer->function = perf_mux_hrtimer_handler;
 }
 
@@ -1121,7 +1121,7 @@ static int perf_mux_hrtimer_restart(stru
        if (!cpuctx->hrtimer_active) {
                cpuctx->hrtimer_active = 1;
                hrtimer_forward_now(timer, cpuctx->hrtimer_interval);
-               hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED);
+               hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED_HARD);
        }
        raw_spin_unlock_irqrestore(&cpuctx->hrtimer_lock, flags);