linux-kernel - [PATCH] arm: Initialize hrtimer-based broadcast clockevent

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Date:   Mon, 22 Jan 2018 07:06:07 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jailhouse <jailhouse-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] arm: Initialize hrtimer-based broadcast clockevent

Analogously to 9358d755bd5c, this registers a broadcast clockevent in
case no hardware broadcast timer is available and the per-CPU timers can
be stopped in deep power states.

Partitions of the Jailhouse hypervisor fall in this category.
Registering the workaround timer allows to enter high-resolution mode in
that case.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 arch/arm/kernel/time.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 629f8e9981f1..0a45d861ef8e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -12,6 +12,7 @@
  *  reading the RTC at bootup, etc...
  */
 #include <linux/clk-provider.h>
+#include <linux/clockchips.h>
 #include <linux/clocksource.h>
 #include <linux/errno.h>
 #include <linux/export.h>
@@ -121,5 +122,7 @@ void __init time_init(void)
 		of_clk_init(NULL);
 #endif
 		timer_probe();
+
+		tick_setup_hrtimer_broadcast();
 	}
 }