Subject: Re: [git pull] drm: previous pull req + 1.
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas =?ISO-8859-1?Q?Hellstr=F6m?= <thomas@shipmail.org>,
       Dave Airlie <airlied@linux.ie>, Alex Deucher <alexdeucher@gmail.com>,
       Andrew Lutomirski <luto@mit.edu>, dri-devel@lists.sf.net,
       Jerome Glisse <jglisse@redhat.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Tue, 23 Jun 2009 10:01:39 +1000
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On Mon, 2009-06-22 at 11:22 -0700, Linus Torvalds wrote:
> Not going to happen.
> 
> Why? 'printk'.
> 
> If you can't handle printk, then you're basically useless. And printk 
> absolutely -has- to work in bad situations (the most important
> messages could happen in any context).

Well... yes and no. If X is frontmost, printk is not going to be
printed, ie, I'm talking about today, when the console is !KD_TEXT.

There -is- a mechanism to deal with these things today, and the console
semaphore does take care of accesses to the fb.

(That doesn't exclude having the ability to force-switch back to kernel
fb for printing things like oops btw, which KMS could do, but for basic
access control, it makes sense).

Cheers,
Ben.


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