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>

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index eb9220cde76c666f4e4182b67f9a2d8c50f99c67..c2858865b1460d8f14f37da2efbf7a96f3542a83 100644 (file)
--- 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