Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-lengthrecord buffer

[Linus Torvalds]

On Thu, May 3, 2012 at 1:02 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> Thing is, with bonkers stuff like usb-console and kms/drm that's a _lot_
> of code running under the logbuf/console locks.

The top-level console lock shouldn't be a problem - we use trylock and
delay if it is held.

It's the lower-level driver-specific locks that screw us up. And quite
frankly, I am *not* willing to say that that is a printk() problem.
That is purely a "USB serial console is damn well broken" issue, and
should not be considered a limitation of printk.

                  Linus
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