ia64/mca: Convert to hotplug state machine

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-ia64@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-5-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 22 deletions

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index eb9220cde76c..c2858865b146 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1890,7 +1890,7 @@ ia64_mca_cpu_init(void *cpu_data)
                                                               PAGE_KERNEL)));
 }
 
-static void ia64_mca_cmc_vector_adjust(void *dummy)
+static int ia64_mca_cpu_online(unsigned int cpu)
 {
         unsigned long flags;
 
@@ -1898,25 +1898,9 @@ static void ia64_mca_cmc_vector_adjust(void *dummy)
         if (!cmc_polling_enabled)
                 ia64_mca_cmc_vector_enable(NULL);
         local_irq_restore(flags);
+        return 0;
 }
 
-static int mca_cpu_callback(struct notifier_block *nfb,
-                                      unsigned long action,
-                                      void *hcpu)
-{
-        switch (action) {
-        case CPU_ONLINE:
-        case CPU_ONLINE_FROZEN:
-                ia64_mca_cmc_vector_adjust(NULL);
-                break;
-        }
-        return NOTIFY_OK;
-}
-
-static struct notifier_block mca_cpu_notifier = {
-        .notifier_call = mca_cpu_callback
-};
-
 /*
  * ia64_mca_init
  *
@@ -2111,15 +2095,13 @@ ia64_mca_late_init(void)
         if (!mca_init)
                 return 0;
 
-        register_hotcpu_notifier(&mca_cpu_notifier);
-
         /* Setup the CMCI/P vector and handler */
         setup_timer(&cmc_poll_timer, ia64_mca_cmc_poll, 0UL);
 
         /* Unmask/enable the vector */
         cmc_polling_enabled = 0;
-        schedule_work(&cmc_enable_work);
-
+        cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/mca:online",
+                          ia64_mca_cpu_online, NULL);
         IA64_MCA_DEBUG("%s: CMCI/P setup and enabled.\n", __func__);
 
 #ifdef CONFIG_ACPI