Re: [patch 7/8] lock validator: s390 use raw_spinlock in mcck handler

[Ingo Molnar]

* Heiko Carstens <heiko.carstens@xxxxxxxxxx> wrote:

> From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> 
> Machine checks on s390 are always enabled (except in the machine check 
> handler itself). Therefore use a raw_spinlock in the machine check 
> handler to avoid deadlocks in the lock validator.

hm, couldnt you use the ->lockdep_recursion mechanism to take care of 
such cases? Just call lockdep_off() when entering a machine exception 
handler, and lockdep_on() when exiting it.

	Ingo
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