[PATCH 4/4] arm64: hibernate: Check for broadcast TLBI support

[Matthias Brugger]

Hibernation makes use of broadcast TLBI. Error out
early when this is not supported by the hardware.

Signed-off-by: Matthias Brugger <mbrugger at suse.com>
---
 arch/arm64/kernel/hibernate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 21ab5df..7269642 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -481,6 +481,11 @@ static int check_boot_cpu_online_pm_callback(struct notifier_block *nb,
 
 static int __init check_boot_cpu_online_init(void)
 {
+	if (cpus_have_cap(ARM64_HAS_NO_BCAST_TLBI)) {
+		pr_err("Can't hibernate: missing broadcast TLBI support.\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Set this pm_notifier callback with a lower priority than
 	 * cpu_hotplug_pm_callback, so that cpu_hotplug_pm_callback will be
-- 
2.6.6