[PATCH] media: imx7-mipi-csis: make array 'registers' static const, makes object smaller

[PATCH] media: imx7-mipi-csis: make array 'registers' static const, makes object smaller

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

Don't populate the array 'registers' on the stack but instead make it
static const. Makes the object code smaller by 10 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
  20138	   5196	    128	  25462	   6376	staging/media/imx/imx7-mipi-csis.o

After:
   text	   data	    bss	    dec	    hex	filename
  20032	   5292	    128	  25452	   636c	staging/media/imx/imx7-mipi-csis.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/staging/media/imx/imx7-mipi-csis.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 73d8354e618c..f8a97b7e2535 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -293,7 +293,7 @@ static int mipi_csis_dump_regs(struct csi_state *state)
 	struct device *dev = &state->pdev->dev;
 	unsigned int i;
 	u32 cfg;
-	struct {
+	static const struct {
 		u32 offset;
 		const char * const name;
 	} registers[] = {
-- 
2.20.1

Re: [PATCH] media: imx7-mipi-csis: make array 'registers' static const, makes object smaller

[Rui Miguel Silva]

Hi Colin,
Thanks for the patch.

On Fri 06 Sep 2019 at 16:08, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Don't populate the array 'registers' on the stack but instead make it
> static const. Makes the object code smaller by 10 bytes.
>
>
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   20138	   5196	    128	  25462	   6376	staging/media/imx/imx7-mipi-csis.o
>
> After:
>    text	   data	    bss	    dec	    hex	filename
>   20032	   5292	    128	  25452	   636c	staging/media/imx/imx7-mipi-csis.o
>
> (gcc version 9.2.1, amd64)
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Looks very good to me.
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

Cheers,
   Rui
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 73d8354e618c..f8a97b7e2535 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -293,7 +293,7 @@ static int mipi_csis_dump_regs(struct csi_state *state)
>  	struct device *dev = &state->pdev->dev;
>  	unsigned int i;
>  	u32 cfg;
> -	struct {
> +	static const struct {
>  		u32 offset;
>  		const char * const name;
>  	} registers[] = {