From mboxrd@z Thu Jan 1 00:00:00 1970 From: mbrugger@suse.com (Matthias Brugger) Date: Thu, 4 Aug 2016 11:15:17 +0200 Subject: [PATCH 4/4] arm64: hibernate: Check for broadcast TLBI support In-Reply-To: <1470302117-32296-1-git-send-email-mbrugger@suse.com> References: <1470302117-32296-1-git-send-email-mbrugger@suse.com> Message-ID: <1470302117-32296-5-git-send-email-mbrugger@suse.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hibernation makes use of broadcast TLBI. Error out early when this is not supported by the hardware. Signed-off-by: Matthias Brugger --- 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