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    Subject[PATCH 05/10] x86: Change NR_CPUS arrays in smpboot_64
    Change the following static arrays sized by NR_CPUS to
    per_cpu data variables:

    task_struct *idle_thread_array[NR_CPUS];

    This is only done if CONFIG_HOTPLUG_CPU is defined
    as otherwise, the array is removed after initialization
    anyways.

    Signed-off-by: Mike Travis <travis@sgi.com>
    Reviewed-by: Christoph Lameter <clameter@sgi.com>
    ---
    arch/x86/kernel/smpboot_64.c | 12 +++++++++++-
    1 file changed, 11 insertions(+), 1 deletion(-)

    --- a/arch/x86/kernel/smpboot_64.c
    +++ b/arch/x86/kernel/smpboot_64.c
    @@ -111,10 +111,20 @@ DEFINE_PER_CPU(int, cpu_state) = { 0 };
    * a new thread. Also avoids complicated thread destroy functionality
    * for idle threads.
    */
    +#ifdef CONFIG_HOTPLUG_CPU
    +/*
    + * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
    + * removed after init for !CONFIG_HOTPLUG_CPU.
    + */
    +static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
    +#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
    +#define set_idle_for_cpu(x,p) (per_cpu(idle_thread_array, x) = (p))
    +#else
    struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
    -
    #define get_idle_for_cpu(x) (idle_thread_array[(x)])
    #define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p))
    +#endif
    +

    /*
    * Currently trivial. Write the real->protected mode
    --


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