> This patch provides users with an option to
> disable/enable cpu at runtime by writing to
> /sys/devices/system/cpu/cpuX/online field.
>
> Eg:
> $ echo [0/1] > /sys/devices/system/cpu/cpu2/online
>
> Signed-off-by: Allen Pais <allen.pais@xxxxxxxxxx>
> Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
> ---
> arch/sparc/kernel/smp_64.c | 48 +++++++++++++++++++++++--------------------
> arch/sparc/kernel/sysfs.c | 4 +++
> 2 files changed, 30 insertions(+), 22 deletions(-)
>
> diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
> index 19cd08d..5ea2f91 100644
> --- a/arch/sparc/kernel/smp_64.c
> +++ b/arch/sparc/kernel/smp_64.c
> @@ -1277,20 +1277,26 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
> {
> int ret = smp_boot_one_cpu(cpu, tidle);
>
> - if (!ret) {
> - cpumask_set_cpu(cpu, &smp_commenced_mask);
> - while (!cpu_online(cpu))
> - mb();
> - if (!cpu_online(cpu)) {
> - ret = -ENODEV;
> - } else {
> - /* On SUN4V, writes to %tick and %stick are
> - * not allowed.
> - */
Any comments on this patch??
Thanks.
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