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Diffstat (limited to 'arch/arm64/kernel/hibernate.c')
-rw-r--r--arch/arm64/kernel/hibernate.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 7e16fb327644..f8df75d740f4 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -17,6 +17,7 @@
#define pr_fmt(x) "hibernate: " x
#include <linux/kvm_host.h>
#include <linux/mm.h>
+#include <linux/notifier.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/suspend.h>
@@ -459,3 +460,28 @@ int swsusp_arch_resume(void)
out:
return rc;
}
+
+static int check_boot_cpu_online_pm_callback(struct notifier_block *nb,
+ unsigned long action, void *ptr)
+{
+ if (action == PM_HIBERNATION_PREPARE &&
+ cpumask_first(cpu_online_mask) != 0) {
+ pr_warn("CPU0 is offline.\n");
+ return notifier_from_errno(-ENODEV);
+ }
+
+ return NOTIFY_OK;
+}
+
+static int __init check_boot_cpu_online_init(void)
+{
+ /*
+ * Set this pm_notifier callback with a lower priority than
+ * cpu_hotplug_pm_callback, so that cpu_hotplug_pm_callback will be
+ * called earlier to disable cpu hotplug before the cpu online check.
+ */
+ pm_notifier(check_boot_cpu_online_pm_callback, -INT_MAX);
+
+ return 0;
+}
+core_initcall(check_boot_cpu_online_init);