linux-kernel - Re: [PATCH] VFS: br_write_lock locks on possible CPUs other than online CPUs

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Date:	Thu, 22 Dec 2011 09:22:43 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	mc@...ux.vnet.ibm.com, Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Nick Piggin <npiggin@...nel.dk>, david@...morbit.com,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] VFS: br_write_lock locks on possible CPUs other than online CPUs

On Wed, Dec 21, 2011 at 11:20:47PM -0800, Andrew Morton wrote:
> On Thu, 22 Dec 2011 07:02:15 +0000 Al Viro <viro@...IV.linux.org.uk> wrote:
> 
> > On Wed, Dec 21, 2011 at 02:12:29PM -0800, Andrew Morton wrote:
> > > off-topic, but the lockdep stuff in include/linux/lglock.h
> > > (LOCKDEP_INIT_MAP and DEFINE_LGLOCK_LOCKDEP) appears to be dead code.
> > 
> > Um?  See ..._lock_init(); it's used there.
> 
> oops, I had Andi's patch applied.
> 
> Wanna take a look at it while things are fresh in your mind?

Double checked: DEFINE_LGLOCK_LOCKDEP is dead now and can be removed.
The stuff it declared is in the struct lglock now.

I can send a patch for that tomorrow if you haven't done it already.

LOCKDEP_INIT_MAP should be still used in lg_lock_init() and that
is called

-Andi
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