linux-kernel - Re: printk() vs tty

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Message-ID: <CA+55aFxNWiRQ1CkifhgcnnBqBa-xRNdM9Ze6bnxhsYd4ZYPg6A@mail.gmail.com>
Date:	Tue, 13 Dec 2011 15:52:35 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Greg KH <greg@...ah.com>, "Theodore Ts'o" <tytso@....edu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: printk() vs tty_io

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.

I *assume* you only get this lockdep warning if you have a serial console?

                       Linus
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