linux-kernel - Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer

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Date:	Thu, 3 May 2012 13:09:47 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Kay Sievers <kay@...y.org>, Greg Kroah-Hartmann <greg@...ah.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length
 record buffer

On Thu, May 3, 2012 at 1:02 PM, Peter Zijlstra <peterz@...radead.org> 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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