Re: printk() vs tty_io

[Alan Cox]

>  - Make a special "debug printk" that is not synchronous. Just make it
> buffer things, and have it actually print out from a worker thread or
> whatever. This one *only* takes the lock for that buffer itself, and
> works everywhere. We could probably even do tricks to make it
> NMI-safe.

No buffer lock needed within limits - our kfifo implementation doesn't
need them on sensible hardware.

Alan
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