Re: [PATCH 4/6] locking/lockdep: Clean up check_redundant() a bit

[Qian Cai]

On Thu, 2020-12-10 at 15:42 +0100, Peter Zijlstra wrote:
[]
>  /*
> @@ -2706,6 +2666,55 @@ static inline int check_irq_usage(struct
>  }
>  #endif /* CONFIG_TRACE_IRQFLAGS */
>  
> +#ifdef CONFIG_LOCKDEP_SMALL
> +/*
> + * Check that the dependency graph starting at <src> can lead to
> + * <target> or not. If it can, <src> -> <target> dependency is already
> + * in the graph.
> + *
> + * Return BFS_RMATCH if it does, or BFS_RMATCH if it does not, return BFS_E* if
> + * any error appears in the bfs search.

Correction -- or BFS_RNOMATCH if it does not.