Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Fix kernel panic on ACPI-based systems where CPU capacity description
  is not currently handled"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: skip register_cpufreq_notifier on ACPI-based systems

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 23e9e13bd2aa..655e65f38f31 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -11,6 +11,7 @@
  * for more details.
  */
 
+#include <linux/acpi.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
 #include <linux/init.h>
@@ -209,7 +210,12 @@ static struct notifier_block init_cpu_capacity_notifier = {
 
 static int __init register_cpufreq_notifier(void)
 {
-        if (cap_parsing_failed)
+        /*
+         * on ACPI-based systems we need to use the default cpu capacity
+         * until we have the necessary code to parse the cpu capacity, so
+         * skip registering cpufreq notifier.
+         */
+        if (!acpi_disabled || cap_parsing_failed)
                 return -EINVAL;
 
         if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {