diff options
| -rw-r--r-- | arch/powerpc/kernel/machine_kexec_64.c | 2 | ||||
| -rw-r--r-- | kernel/kexec.c | 8 |
2 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c index 59d229a2a3e..879b3aacac3 100644 --- a/arch/powerpc/kernel/machine_kexec_64.c +++ b/arch/powerpc/kernel/machine_kexec_64.c @@ -237,7 +237,7 @@ static void wake_offline_cpus(void) if (!cpu_online(cpu)) { printk(KERN_INFO "kexec: Waking offline cpu %d.\n", cpu); - cpu_up(cpu); + WARN_ON(cpu_up(cpu)); } } } diff --git a/kernel/kexec.c b/kernel/kexec.c index c8380ad203b..28c57069ef6 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1683,6 +1683,14 @@ int kernel_kexec(void) kexec_in_progress = true; kernel_restart_prepare(NULL); migrate_to_reboot_cpu(); + + /* + * migrate_to_reboot_cpu() disables CPU hotplug assuming that + * no further code needs to use CPU hotplug (which is true in + * the reboot case). However, the kexec path depends on using + * CPU hotplug again; so re-enable it here. + */ + cpu_hotplug_enable(); printk(KERN_EMERG "Starting new kernel\n"); machine_shutdown(); } |