linux-kernel - Re: [PATCH 1/2] tracing/filter: remove preds from struct event

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Date:	Thu, 09 Jul 2009 23:04:34 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tracing/filter: remove preds from struct
 event_subsystem

On Thu, 2009-07-09 at 16:20 +0800, Xiao Guangrong wrote:
> No need to save preds to event_subsystem, because it's not used.
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>

Makes sense to me.

Acked-by: Tom Zanussi <tzanussi@...il.com>

> ---
>  kernel/trace/trace_events_filter.c |   39 +++++------------------------------
>  1 files changed, 6 insertions(+), 33 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
> index 936c621..b9aae72 100644
> --- a/kernel/trace/trace_events_filter.c
> +++ b/kernel/trace/trace_events_filter.c
> @@ -420,17 +420,7 @@ EXPORT_SYMBOL_GPL(init_preds);
>  
>  static void filter_free_subsystem_preds(struct event_subsystem *system)
>  {
> -	struct event_filter *filter = system->filter;
>  	struct ftrace_event_call *call;
> -	int i;
> -
> -	if (filter->n_preds) {
> -		for (i = 0; i < filter->n_preds; i++)
> -			filter_free_pred(filter->preds[i]);
> -		kfree(filter->preds);
> -		filter->preds = NULL;
> -		filter->n_preds = 0;
> -	}
>  
>  	list_for_each_entry(call, &ftrace_events, list) {
>  		if (!call->define_fields)
> @@ -607,26 +597,9 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
>  				     struct filter_pred *pred,
>  				     char *filter_string)
>  {
> -	struct event_filter *filter = system->filter;
>  	struct ftrace_event_call *call;
>  	int err = 0;
>  
> -	if (!filter->preds) {
> -		filter->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
> -					GFP_KERNEL);
> -
> -		if (!filter->preds)
> -			return -ENOMEM;
> -	}
> -
> -	if (filter->n_preds == MAX_FILTER_PRED) {
> -		parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
> -		return -ENOSPC;
> -	}
> -
> -	filter->preds[filter->n_preds] = pred;
> -	filter->n_preds++;
> -
>  	list_for_each_entry(call, &ftrace_events, list) {
>  
>  		if (!call->define_fields)
> @@ -1029,12 +1002,12 @@ static int replace_preds(struct event_subsystem *system,
>  
>  		if (elt->op == OP_AND || elt->op == OP_OR) {
>  			pred = create_logical_pred(elt->op);
> -			if (call) {
> +			if (call)
>  				err = filter_add_pred(ps, call, pred);
> -				filter_free_pred(pred);
> -			} else
> +			else
>  				err = filter_add_subsystem_pred(ps, system,
>  							pred, filter_string);
> +			filter_free_pred(pred);
>  			if (err)
>  				return err;
>  
> @@ -1048,12 +1021,12 @@ static int replace_preds(struct event_subsystem *system,
>  		}
>  
>  		pred = create_pred(elt->op, operand1, operand2);
> -		if (call) {
> +		if (call)
>  			err = filter_add_pred(ps, call, pred);
> -			filter_free_pred(pred);
> -		} else
> +		else
>  			err = filter_add_subsystem_pred(ps, system, pred,
>  							filter_string);
> +		filter_free_pred(pred);
>  		if (err)
>  			return err;
>  

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