On Thu, Jun 26, 2008 at 02:29:54PM +0200, [EMAIL PROTECTED] wrote:
> +void (*pm_power_off)(void) = NULL;
> +EXPORT_SYMBOL(pm_power_off);
> +
> +void cpu_idle(void)
> +{
> + set_thread_flag(TIF_POLLING_NRFLAG);
> +
> + while (1) {
> + while (!need_resched())
> + cpu_relax();
> +
> + preempt_enable_no_resched();
> + schedule();
> + preempt_disable();
> + }
> +}
> +
A couple things to note here. You have a pm_power_off, but no pm_idle.
You set TIF_POLLING_NRFLAG but don't have any explicit clearing and
resetting of it if the CPU is sleeping. In the cpu_relax() case this is
ok, but if you have a cpu_sleep() you will want to use in the SMP case,
you will need to handle it explicitly.
Beyond that, you may also want to stub in the
tick_nohz_stop_sched_tick()/tick_nohz_restart_sched_tick() calls, then
when you implement the generic clockevents you will already have the
tickless bits in place.
check_pgt_cache() is also helpful here for quicklist trimming, though you
may not care if you never plan to have an MMU.
You can look at arch/sh/kernel/process_32.c for examples.
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