[patch V4 24/37] csky/smp: Switch to hotplug core state synchronization

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Switch to the CPU hotplug core state tracking and synchronization
mechanim. No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
---
 arch/csky/Kconfig           |    1 +
 arch/csky/include/asm/smp.h |    2 +-
 arch/csky/kernel/smp.c      |    8 ++------
 3 files changed, 4 insertions(+), 7 deletions(-)


--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -96,6 +96,7 @@ config CSKY
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_STACKPROTECTOR
        select HAVE_SYSCALL_TRACEPOINTS
+       select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
        select MAY_HAVE_SPARSE_IRQ
        select MODULES_USE_ELF_RELA if MODULES
        select OF
--- a/arch/csky/include/asm/smp.h
+++ b/arch/csky/include/asm/smp.h
@@ -23,7 +23,7 @@ void __init set_send_ipi(void (*func)(co
 
 int __cpu_disable(void);
 
-void __cpu_die(unsigned int cpu);
+static inline void __cpu_die(unsigned int cpu) { }
 
 #endif /* CONFIG_SMP */
 
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -291,12 +291,8 @@ int __cpu_disable(void)
        return 0;
 }
 
-void __cpu_die(unsigned int cpu)
+void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
 {
-       if (!cpu_wait_death(cpu, 5)) {
-               pr_crit("CPU%u: shutdown failed\n", cpu);
-               return;
-       }
        pr_notice("CPU%u: shutdown\n", cpu);
 }
 
@@ -304,7 +300,7 @@ void __noreturn arch_cpu_idle_dead(void)
 {
        idle_task_exit();
 
-       cpu_report_death();
+       cpuhp_ap_report_dead();
 
        while (!secondary_stack)
                arch_cpu_idle();