linux-kernel - Re: [GIT PATCH] TTY patches for 2.6.33-git

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Date:	Sat, 12 Dec 2009 14:25:23 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Greg KH <gregkh@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PATCH] TTY patches for 2.6.33-git



On Sat, 12 Dec 2009, Thomas Gleixner wrote:
> 
> Just patched the following in and it catched your problem nicely. With
> your AB/BA fix patch applied everything is fine.

Actually, the patch I just suggested might be better. Admittedly the 
CONFIG_PREEMPT case is the more important one (and the one that will catch 
more cases), but even without preemptyion the might_sleep() in 
_lock_kernel() (one underscore) would trigger on the case of somebody 
doing lock_kernel with local interrupts disabled.

		Linus
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