linux-kernel - Re: [PATCH 3/3] Increase lockdep limits: MAX_LOCKDEP_CHAINS

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Date:	Tue, 07 Jul 2009 17:32:51 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Joao Correia <joaomiguelcorreia@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Amerigo Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH 3/3] Increase lockdep limits: MAX_LOCKDEP_CHAINS_BITS

On Tue, 2009-07-07 at 16:25 +0100, Joao Correia wrote:
> (Applies to current Linus tree, as of 2.6.31-rc2)
> 
> A third limit becomes apparent as being too low after raising
> MAX_STACK_TRACE_ENTRIES and MAX_LOCK_DEPTH, although this one is more
> elusive to trigger.

Hrmm, I really wonder what takes all these chains, I never run into this
stuff. We recently fixed the dma-debug code to generate less classes,
could there be more such bugs?

> Signed-off-by: Joao Correia <joaomiguelcorreia@...il.com>
> 
> ---
>  kernel/lockdep_internals.h | 2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
> index 699a2ac..93af1f1 100644
> --- a/kernel/lockdep_internals.h
> +++ b/kernel/lockdep_internals.h
> @@ -56,7 +56,7 @@ enum {
>   */
>  #define MAX_LOCKDEP_ENTRIES    16384UL
> 
> -#define MAX_LOCKDEP_CHAINS_BITS        15
> +#define MAX_LOCKDEP_CHAINS_BITS        16
>  #define MAX_LOCKDEP_CHAINS     (1UL << MAX_LOCKDEP_CHAINS_BITS)
> 
>  #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
> ---

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