linux-kernel - Re: BUG: lock held when returning to user space

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Message-ID: <alpine.LFD.0.999.0710270934250.30120@woody.linux-foundation.org>
Date:	Sat, 27 Oct 2007 09:35:01 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Jiri Kosina <jikos@...os.cz>,
	Gabriel C <nix.or.die@...glemail.com>, a.zummo@...ertech.it,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	rtc-linux@...glegroups.com, Ingo Molnar <mingo@...e.hu>
Subject: Re: BUG: lock held when returning to user space



On Sat, 27 Oct 2007, Peter Zijlstra wrote:
> 
> Now I could probably come up with an annotation to hide it, but what do
> other people think, Ingo, Linus, Andrew, do we want to keep kernel locks
> held over userspace?

Definitely not a sane thing to do. It should use ref-counting and/or a 
single bit to say "busy". 

			Linus
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