[PATCH 02/21] ARM: shmobile: Convert to hotplug state machine

[Sebastian Andrzej Siewior]

Install the callbacks via the state machine.

Cc: Simon Horman <ho...@verge.net.au>
Cc: Magnus Damm <magnus.d...@gmail.com>
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux...@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 arch/arm/mach-shmobile/platsmp-scu.c | 26 ++++++++------------------
 include/linux/cpuhotplug.h           |  1 +
 2 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/arch/arm/mach-shmobile/platsmp-scu.c 
b/arch/arm/mach-shmobile/platsmp-scu.c
index 8d478f1da265..d1ecaf37d142 100644
--- a/arch/arm/mach-shmobile/platsmp-scu.c
+++ b/arch/arm/mach-shmobile/platsmp-scu.c
@@ -21,26 +21,14 @@
 static phys_addr_t shmobile_scu_base_phys;
 static void __iomem *shmobile_scu_base;
 
-static int shmobile_smp_scu_notifier_call(struct notifier_block *nfb,
-                                         unsigned long action, void *hcpu)
+static int shmobile_scu_cpu_prepare(unsigned int cpu)
 {
-       unsigned int cpu = (long)hcpu;
-
-       switch (action) {
-       case CPU_UP_PREPARE:
-               /* For this particular CPU register SCU SMP boot vector */
-               shmobile_smp_hook(cpu, virt_to_phys(shmobile_boot_scu),
-                                 shmobile_scu_base_phys);
-               break;
-       };
-
-       return NOTIFY_OK;
+       /* For this particular CPU register SCU SMP boot vector */
+       shmobile_smp_hook(cpu, virt_to_phys(shmobile_boot_scu),
+                         shmobile_scu_base_phys);
+       return 0;
 }
 
-static struct notifier_block shmobile_smp_scu_notifier = {
-       .notifier_call = shmobile_smp_scu_notifier_call,
-};
-
 void __init shmobile_smp_scu_prepare_cpus(phys_addr_t scu_base_phys,
                                          unsigned int max_cpus)
 {
@@ -54,7 +42,9 @@ void __init shmobile_smp_scu_prepare_cpus(phys_addr_t 
scu_base_phys,
        scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
 
        /* Use CPU notifier for reset vector control */
-       register_cpu_notifier(&shmobile_smp_scu_notifier);
+       cpuhp_setup_state_nocalls(CPUHP_ARM_SHMOBILE_SCU_PREPARE,
+                                 "arm/shmobile-scu:prepare",
+                                 shmobile_scu_cpu_prepare, NULL);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 0da071ff36d2..008eed0c0787 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -35,6 +35,7 @@ enum cpuhp_state {
        CPUHP_POWERPC_PMAC_PREPARE,
        CPUHP_POWERPC_MMU_CTX_PREPARE,
        CPUHP_NOTIFY_PREPARE,
+       CPUHP_ARM_SHMOBILE_SCU_PREPARE,
        CPUHP_TIMERS_DEAD,
        CPUHP_BRINGUP_CPU,
        CPUHP_AP_IDLE_DEAD,
-- 
2.9.3