Re: [debug patch] printk: Add a printk killswitch to robustify NMI watchdog messages

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Wed, 2011-06-08 at 21:17 +0200, Ingo Molnar wrote:
> Hm, the no-wakeup aspect seems rather useful.
> 
> Could we perhaps remove console_sem and replace it with a mutex and 
> do something like this with a mutex and its ->wait_lock?
> 
> We'd have two happy side effects:
> 
>  - we'd thus remove one of the last core kernel semaphore users
>  - we'd gain lockdep coverage for console locking as a bonus ... 

The mutex thing is more complex due to the mutex fast path, the
advantage of the semaphore is its simple implementation that always
takes the internal lock.

I guess I can make it happen, but its a tad more tricky.
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