[PATCH] 8xx: get_mmu_context() for (very) FEW_CONTEXTS and KERNEL_PREEMPT race/starvation issue

[Benjamin Herrenschmidt]

> I'm still a bit confused with "kernel preemption". One thing for sure
> is that disabling kernel preemption does indeed fix my problem.
> So, my question is, what if a task in the middle of being schedule
> gets preempted by an IRQ handler, where will this task restart
> execution ? Back at the beginning of schedule or where it left of ?

I very much doubt that schedule itself can be preempted :)

> The idea behind my patch was to get rid of that nr_free_contexts
> counter that is (I thing) redundant with the context_map.