2019-09-07 02:01:46

by Colin King

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

From: Colin Ian King <[email protected]>

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 <[email protected]>
---
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

2019-09-10 18:52:31

by Rui Miguel Silva

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

Hi Colin,
Thanks for the patch.

On Fri 06 Sep 2019 at 16:08, Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> 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 <[email protected]>

Looks very good to me.
Reviewed-by: Rui Miguel Silva <[email protected]>

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[] = {