linux-kernel - Re: [PATCH] lockdep: fix ide/proc interaction

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Date:	Thu, 19 Oct 2006 14:37:42 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] lockdep: fix ide/proc interaction

On Thu, Oct 19, 2006 at 01:05:56PM +0200, Peter Zijlstra wrote:
> On Thu, 2006-10-19 at 10:40 +0200, Jarek Poplawski wrote:
...
> > But now:
> > >  (proc_subdir_lock){--..}, at: [<c04a33b0>] remove_proc_entry+0x40/0x191
> > 
> > is taken here with irqs and bhs enabled (btw. this: {--..} looks
> > as if it wasn't called from here with spin_lock_irqsave?) 
> > IMHO it is hard to believe this lock isn't anywhere used in
> > hard or soft irq context so probably local_irq_disable/enable
> > or local_bh_disable/enable is needed around this.
> 
> it really isnt, check fs/proc/{generic,proc_devtree}.c

I did it - but I hope all places were checked and 
remove_proc_entry (or other with proc_subdir_lock)
is not used by any timer etc. 

Sorry for false alarm,

Regards,

Jarek P.
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