linux-kernel - Re: [PATCH] lockdep: Fix wrong condition to print bug msgs for MAX_LOCKDEP_CHAIN

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Message-ID: <20170206150542.GP6515@twins.programming.kicks-ass.net>
Date:   Mon, 6 Feb 2017 16:05:42 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lockdep: Fix wrong condition to print bug msgs for
 MAX_LOCKDEP_CHAIN_HLOCKS

On Fri, Jan 13, 2017 at 11:42:04AM +0900, Byungchul Park wrote:
> Bug messages and stack dump for MAX_LOCKDEP_CHAIN_HLOCKS should be
> printed only at the first time.
> 
> Signed-off-by: Byungchul Park <byungchul.park@....com>

Indeed, thanks!

> ---
>  kernel/locking/lockdep.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> index f37156f..a143eb4 100644
> --- a/kernel/locking/lockdep.c
> +++ b/kernel/locking/lockdep.c
> @@ -2166,7 +2166,7 @@ static inline int add_chain_cache(struct task_struct *curr,
>  	 * Important for check_no_collision().
>  	 */
>  	if (unlikely(nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)) {
> -		if (debug_locks_off_graph_unlock())
> +		if (!debug_locks_off_graph_unlock())
>  			return 0;
>  
>  		print_lockdep_off("BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!");
> -- 
> 1.9.1
>