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SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?

* Ingo Molnar <mingo@elte.hu> wrote:

> > might be an incorrect printout of stack_left :( The esp looks more or
> > less normal. Not sure why it printed -52.
>
> here's the stack_left calculation:
>
> + printk("ds: %04x es: %04x ss: %04x preempt: %08x\n",
> + regs->xds & 0xffff, regs->xes & 0xffff, ss, preempt_count());
> + printk("Process %s (pid: %d, threadinfo=%p task=%p stack_left=%ld worst_left=%ld)",
> + current->comm, current->pid, current_thread_info(), current,
> + (regs->esp & (THREAD_SIZE-1))-sizeof(struct thread_info),
> + worst_stack_left);
>
> i cannot see anything wrong in it, [...]

that should be "esp", not "regs->esp". regs->esp is something different
upon in-kernel faults. I've uploaded -27 with the fix - but it should
only confirm that it's not a stack overflow.

Ingo
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