linux-kernel - Re: [PATCH 09/10] tracing/filter: Change filter_match_preds function to use walk_pred

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Date:	Wed, 10 Aug 2011 17:14:29 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] tracing/filter: Change filter_match_preds
 function to use walk_pred_tree

On Thu, 2011-08-04 at 12:08 +0200, Jiri Olsa wrote:
> Changing filter_match_preds function to use unified predicates tree
> processing.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> ---
>  kernel/trace/trace_events_filter.c |  119 +++++++++++++++++-------------------
>  1 files changed, 55 insertions(+), 64 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
> index d4e0c09..55b13b9 100644
> --- a/kernel/trace/trace_events_filter.c
> +++ b/kernel/trace/trace_events_filter.c
> @@ -467,6 +467,7 @@ static int process_ops(struct filter_pred *preds,
>  
>  	for (i = 0; i < op->val; i++) {
>  		pred = &preds[op->ops[i]];
> +		BUG_ON(!pred->fn);

Why the added BUG_ON()s? Do we really need to crash the kernel on error
here?

-- Steve

>  		match = pred->fn(pred, rec);
>  		if (!!match == type)
>  			return match;
> @@ -474,92 +475,82 @@ static int process_ops(struct filter_pred *preds,
>  	return match;
>  }
>  
> +struct filter_match_preds_data {
> +	struct filter_pred *preds;
> +	int match;
> +	void *rec;
> +};
> +
> +static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred,
> +				 int *err, void *data)
> +{
> +	struct filter_match_preds_data *d = data;
> +
> +	*err = 0;
> +	switch (move) {
> +	case MOVE_DOWN:
> +		/* only AND and OR have children */
> +		if (pred->left != FILTER_PRED_INVALID) {
> +			/* If ops is set, then it was folded. */
> +			if (!pred->ops)
> +				return WALK_PRED_DEFAULT;
> +			/* We can treat folded ops as a leaf node */
> +			d->match = process_ops(d->preds, pred, d->rec);
> +		} else {
> +			BUG_ON(!pred->fn);
> +			d->match = pred->fn(pred, d->rec);
> +		}


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