linux-kernel - Re: printk() vs tty

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Message-ID: <20111215103220.7c08498f@pyramind.ukuu.org.uk>
Date:	Thu, 15 Dec 2011 10:32:20 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Ted Ts'o" <tytso@....edu>, Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: printk() vs tty_io

> We probably could, I can have a closer look, but the main question is,
> are we going to commit to no wakeups from console implementations? That
> would mean removing the USB serial console support and other such stuff.

That's a non starter.

> [ Personally I think USB serial console is insane, if you really need
> something like that use the ehci-dbgp thing, that at least has a chance
> of working. ]

Sometimes USB serial console is the best you've got.

> If we're not going to commit to that (which would be valid choice given
> where we are), my printk efforts are pointless and I'll reconsider.

For lockdep spews do they need to be spewed synchronously - clearly it's
good if they can be but its possible that they could be buffered ?

Alan
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