linux-kernel - Re: printk() vs tty

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Message-ID: <20111214104308.14d0500c@pyramind.ukuu.org.uk>
Date:	Wed, 14 Dec 2011 10:43:08 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Greg KH <greg@...ah.com>,
	"Theodore Ts'o" <tytso@....edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: printk() vs tty_io

On Tue, 13 Dec 2011 15:52:35 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Tue, Dec 13, 2011 at 11:33 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > I've been poking at reducing the constraints on printk(), like make it
> > work under rq->lock etc..
> 
> You aren't supposed register a console that wakes things up. But the
> only console that honors that afaik is the traditional vt console.
> *Maybe* the network console, I didn't check.

Serial console tries to be good as does netconsole. Serial USB console
can't so just does its best.

Not sure about some of the DRM framebuffer ones either.

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