On 05.07.2017 20:07, Gustavo A. R. Silva wrote:
> Remove unnecessary static on local variable rtype.
> Such variable is initialized before being used,
> on every execution path throughout the function.
> The static has no benefit and, removing it reduces
> the code size.
>
> This issue was detected using Coccinelle and the following semantic patch:
>
> @bad exists@
> position p;
> identifier x;
> type T;
> @@
>
> static T x@p;
> ...
> x = <+...x...+>
>
> @@
> identifier x;
> expression e;
> type T;
> position p != bad.p;
> @@
>
> -static
> T x@p;
> ... when != x
> when strict
> ?x = e;
>
> In the following log you can see the difference in the code size. Also,
> there is a significant difference in the bss segment. This log is the
> output of the size command, before and after the code change:
>
> before:
> text data bss dec hex filename
> 27765 5656 320 33741 83cd drivers/media/i2c/s5k5baf.o
>
> after:
> text data bss dec hex filename
> 27733 5600 256 33589 8335 drivers/media/i2c/s5k5baf.o
>
>
> Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
--
Regards
Andrzej
> ---
> drivers/media/i2c/s5k5baf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/s5k5baf.c b/drivers/media/i2c/s5k5baf.c
> index 962051b..f01722d 100644
> --- a/drivers/media/i2c/s5k5baf.c
> +++ b/drivers/media/i2c/s5k5baf.c
> @@ -1374,7 +1374,7 @@ static int s5k5baf_get_selection(struct v4l2_subdev *sd,
> struct v4l2_subdev_pad_config *cfg,
> struct v4l2_subdev_selection *sel)
> {
> - static enum selection_rect rtype;
> + enum selection_rect rtype;
> struct s5k5baf *state = to_s5k5baf(sd);
>
> rtype = s5k5baf_get_sel_rect(sel->pad, sel->target);
