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    Subject[PATCH 8/8] kernel/cpu.c: Define bsp_hotpluggable variable
    Date
    From: Fenghua Yu <fenghua.yu@intel.com>

    This gloable variable controls BSP (aka CPU0) hotplug. If set, BSP is
    hotpluggable. By default, it's 0. On X86, kernel option bsp_hotpluggable sets
    the variable as 1.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    ---
    include/linux/cpu.h | 2 ++
    kernel/cpu.c | 5 +++++
    2 files changed, 7 insertions(+), 0 deletions(-)

    diff --git a/include/linux/cpu.h b/include/linux/cpu.h
    index b1a635a..1b0b1ad 100644
    --- a/include/linux/cpu.h
    +++ b/include/linux/cpu.h
    @@ -172,6 +172,8 @@ extern void put_online_cpus(void);
    #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
    int cpu_down(unsigned int cpu);

    +extern int bsp_hotpluggable;
    +
    #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
    extern void cpu_hotplug_driver_lock(void);
    extern void cpu_hotplug_driver_unlock(void);
    diff --git a/kernel/cpu.c b/kernel/cpu.c
    index 12b7458..65d1a13 100644
    --- a/kernel/cpu.c
    +++ b/kernel/cpu.c
    @@ -43,6 +43,11 @@ static int cpu_hotplug_disabled;

    #ifdef CONFIG_HOTPLUG_CPU

    +/*
    + * If set, BSP (aka CPU0) can be onlined/offlined. By default, it's not set.
    + */
    +int bsp_hotpluggable;
    +
    static struct {
    struct task_struct *active_writer;
    struct mutex lock; /* Synchronizes accesses to refcount, */
    --
    1.6.0.3


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