linux-kernel - Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest

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Date:	Mon, 4 Aug 2008 10:53:18 -0400
From:	Dave Jones <davej@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Roland Dreier <rdreier@...co.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, jeremy@...p.org,
	hugh@...itas.com, mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock()

On Mon, Aug 04, 2008 at 04:32:12PM +0200, Peter Zijlstra wrote:
 > On Mon, 2008-08-04 at 07:26 -0700, Roland Dreier wrote:
 > > > No more than 48 locks (mutexes, rwlocks, spinlock, RCU, everything
 > >  > covered by lockdep) held by any one code-path; including nested
 > >  > interrupt contexts.
 > > 
 > > Does that mean that something like the new mm_take_all_locks() operation
 > > is going to explode if someone tries to use it with lockdep on?
 > 
 > Gah - yes, clearly nobody tried this.. :-/
 > 
 > Just looking at the code it will not only run into this limit, but it
 > would warn about recursion on the second file/anon vma due to utter lack
 > of annotation.
 > 
 > Why are people still developing without lockdep?

More puzzling, is why hasn't this triggered in the Fedora rawhide kernels,
which do have lockdep enabled.

	Dave

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