linux-kernel - Re: [PATCH] lockdep: Fix redundant_hardirqs

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Message-Id: <20100427173227.7ec29329.sfr@canb.auug.org.au>
Date:	Tue, 27 Apr 2010 17:32:27 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] lockdep: Fix redundant_hardirqs_on incremented with
 irqs enabled

Hi Frederic,

On Thu, 15 Apr 2010 15:37:50 +0200 Frederic Weisbecker <fweisbec@...il.com> wrote:
>
> When a path restore the flags while irqs are already enabled, we
> update the per cpu var redundant_hardirqs_on in a racy fashion
> and debug_atomic_inc() warns about this situation.
> 
> In this particular case, we need to explictly disable the irqs before
> updating this stat var in order to update it safely.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: David Miller <davem@...emloft.net>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
>  kernel/lockdep.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)

Ping?  Any movement on this?

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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