linux-kernel - Re: [GIT PULL] core/locking changes for v3.1

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Date:	Mon, 25 Jul 2011 12:09:59 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] core/locking changes for v3.1

On Sun, 2011-07-24 at 21:06 -0400, Arnaud Lacombe wrote:
> > Peter Zijlstra (1):
> >      lockdep: Fix lockdep_no_validate against IRQ states
> >
> from today's master, this last commit triggers:
> 
> /src/linux/linux/kernel/lockdep.c: In function 'mark_held_locks':
> /src/linux/linux/kernel/lockdep.c:2471:31: warning: comparison of
> distinct pointer types lacks a cast
> 
> I'm not sure if both struct member and variable's type are correct nor
> the comparability between `struct lockdep_subclass_key *' and `struct
> lock_class_key *'. So I'll let you fix this. 

Argh, I really need -Werror to even see warnings, compiler output just
flies by waaaaaay too fast.

The warning is harmless in this case, but the below makes it go away.

---
 kernel/lockdep.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 3956f51..99906aa 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2468,7 +2468,7 @@ mark_held_locks(struct task_struct *curr, enum mark_type mark)
 
 		BUG_ON(usage_bit >= LOCK_USAGE_STATES);
 
-		if (hlock_class(hlock)->key == &__lockdep_no_validate__)
+		if (hlock_class(hlock)->key == __lockdep_no_validate__.subkeys)
 			continue;
 
 		if (!mark_lock(curr, hlock, usage_bit))


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