linux-kernel - Re: [PATCH 02/18] tracing/filter: use ARRAY

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Date:   Tue, 3 Oct 2017 21:05:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jérémy Lefaure <jeremy.lefaure@....epita.fr>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/18] tracing/filter: use ARRAY_SIZE

On Sun,  1 Oct 2017 15:30:40 -0400
Jérémy Lefaure <jeremy.lefaure@....epita.fr> wrote:

> It is useless to re-invent the ARRAY_SIZE macro so let's use it instead
> of DATA_CNT.
> 
> Found with Coccinelle with the following semantic patch:
> @r depends on (org || report)@
> type T;
> T[] E;
> position p;
> @@
> (
>  (sizeof(E)@p /sizeof(*E))
> |
>  (sizeof(E)@p /sizeof(E[...]))
> |
>  (sizeof(E)@p /sizeof(T))
> )
> 
> Signed-off-by: Jérémy Lefaure <jeremy.lefaure@....epita.fr>
> ---
>  kernel/trace/trace_events_filter.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
> index 61e7f0678d33..02d0f378dc5c 100644
> --- a/kernel/trace/trace_events_filter.c
> +++ b/kernel/trace/trace_events_filter.c
> @@ -23,6 +23,7 @@
>  #include <linux/mutex.h>
>  #include <linux/perf_event.h>
>  #include <linux/slab.h>
> +#include <linux/kernel.h>
>  
>  #include "trace.h"
>  #include "trace_output.h"
> @@ -2376,8 +2377,6 @@ static struct test_filter_data_t {
>  #undef YES
>  #undef NO
>  
> -#define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t))

Just change DATA_CNT to be:

 #define DATA_CNT ARRAY_SIZE(test_filter_data)

and don't change the rest.

-- Steve

> -
>  static int test_pred_visited;
>  
>  static int test_pred_visited_fn(struct filter_pred *pred, void *event)
> @@ -2417,7 +2416,7 @@ static __init int ftrace_test_event_filter(void)
>  
>  	printk(KERN_INFO "Testing ftrace filter: ");
>  
> -	for (i = 0; i < DATA_CNT; i++) {
> +	for (i = 0; i < ARRAY_SIZE(test_filter_data); i++) {
>  		struct event_filter *filter = NULL;
>  		struct test_filter_data_t *d = &test_filter_data[i];
>  		int err;
> @@ -2463,7 +2462,7 @@ static __init int ftrace_test_event_filter(void)
>  		}
>  	}
>  
> -	if (i == DATA_CNT)
> +	if (i == ARRAY_SIZE(test_filter_data))
>  		printk(KERN_CONT "OK\n");
>  
>  	return 0;