[PATCH 05/21] sh: SH-X3 SMP: Convert to hotplug state machine

[Sebastian Andrzej Siewior]

Install the callbacks via the state machine.

Cc: linux...@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 arch/sh/kernel/cpu/sh4a/smp-shx3.c | 26 +++++---------------------
 include/linux/cpuhotplug.h         |  1 +
 2 files changed, 6 insertions(+), 21 deletions(-)

diff --git a/arch/sh/kernel/cpu/sh4a/smp-shx3.c 
b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
index 839612c8a0a0..0d3637c494bf 100644
--- a/arch/sh/kernel/cpu/sh4a/smp-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
@@ -122,32 +122,16 @@ static void shx3_update_boot_vector(unsigned int cpu)
        __raw_writel(STBCR_RESET, STBCR_REG(cpu));
 }
 
-static int
-shx3_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+static int shx3_cpu_prepare(unsigned int cpu)
 {
-       unsigned int cpu = (unsigned int)hcpu;
-
-       switch (action) {
-       case CPU_UP_PREPARE:
-               shx3_update_boot_vector(cpu);
-               break;
-       case CPU_ONLINE:
-               pr_info("CPU %u is now online\n", cpu);
-               break;
-       case CPU_DEAD:
-               break;
-       }
-
-       return NOTIFY_OK;
+       shx3_update_boot_vector(cpu);
+       return 0;
 }
 
-static struct notifier_block shx3_cpu_notifier = {
-       .notifier_call          = shx3_cpu_callback,
-};
-
 static int register_shx3_cpu_notifier(void)
 {
-       register_hotcpu_notifier(&shx3_cpu_notifier);
+       cpuhp_setup_state_nocalls(CPUHP_SH_SH3X_PREPARE, "sh/shx3:prepare",
+                                 shx3_cpu_prepare, NULL);
        return 0;
 }
 late_initcall(register_shx3_cpu_notifier);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 35859aafbbfc..8dec2a236af3 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -37,6 +37,7 @@ enum cpuhp_state {
        CPUHP_POWERPC_MMU_CTX_PREPARE,
        CPUHP_NOTIFY_PREPARE,
        CPUHP_ARM_SHMOBILE_SCU_PREPARE,
+       CPUHP_SH_SH3X_PREPARE,
        CPUHP_TIMERS_DEAD,
        CPUHP_BRINGUP_CPU,
        CPUHP_AP_IDLE_DEAD,
-- 
2.9.3