Re: [patch, -rc5-mm1] lock validator: disable NMI watchdog if CONFIG_LOCKDEP, i386

* Ingo Molnar <[email protected]> wrote:

> yeah, totally agreed, they need to be raw notifiers. Havent had time 
> to investigate it in detail yet - i went for the easier hack of 
> disabling NMIs while lockdep is enabled.

hm ... atomic_notifier_call_chain ought to be fine - it uses 
rcu_read_lock(), which uses preempt_disable(), which is NMI-safe.

so i think this NMI problem might be lockdep-specific. I think it might 
be the NMI iret that confuses lockdep. (and irqflags-trace in 
particular)

	Ingo
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• References:
  • [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Ingo Molnar <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Mike Galbraith <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Mike Galbraith <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Ingo Molnar <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Mike Galbraith <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Ingo Molnar <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator, fix NULL type->name bug
    • From: Mike Galbraith <[email protected]>
  • [patch, -rc5-mm1] lock validator: disable NMI watchdog if CONFIG_LOCKDEP, i386
    • From: Ingo Molnar <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator: disable NMI watchdog if CONFIG_LOCKDEP, i386
    • From: Andi Kleen <[email protected]>
  • Re: [patch, -rc5-mm1] lock validator: disable NMI watchdog if CONFIG_LOCKDEP, i386
    • From: Ingo Molnar <[email protected]>

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