linux-kernel - Re: [patch] lock debugging: fix DEBUG_LOCKS_WARN_ON() & debug_locks

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Date:	Tue, 19 Dec 2006 10:44:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Jarek Poplawski <jarkao2@...pl>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch] lock debugging: fix DEBUG_LOCKS_WARN_ON() & debug_locks_silent


* Matthew Wilcox <matthew@....cx> wrote:

> On Tue, Dec 19, 2006 at 10:31:35AM +0100, Ingo Molnar wrote:
> > 
> > * Jarek Poplawski <jarkao2@...pl> wrote:
> > 
> > > >  	if (unlikely(c)) {						\
> > > > -		if (debug_locks_silent || debug_locks_off())		\
> > > > +		if (!debug_locks_silent && debug_locks_off())		\
> > 
> > btw., updated patch is below - the right order is to first do 
> > debug_locks_off(), then debug_locks_silent.
> 
> Then how does one re-enable lock debugging after running the locking 
> testsuite?

see the lib/locking-selftest.c:locking_selftest() function, if all 
testcases pass then it re-enables lock debugging. If a testcase turns 
off lock debugging because it triggers a bug (as many of them 
legitimately do), then reset_locks()->lockdep_reset() will set 
debug_locks back to 1.

	Ingo
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