[PATCH] gpio: make several const arrays static, shrinks object size

[PATCH] gpio: make several const arrays static, shrinks object size

[Colin King]

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

Don't populate the const read-only arrays 'port' on the stack but
instead make them static. Makes the object code smaller:

Before:
  text    data     bss     dec    hex filename
  8542    4088     672   13302   33f6 drivers/gpio/gpio-gpio-mm.o
 10959    4952     832   16743   4167 drivers/gpio/gpio-104-dio-48e.o
  9022    5064    1408   15494   3c86 drivers/gpio/gpio-104-idi-48.o

After:
  text    data     bss     dec    hex filename
  8372    4144     672   13188   3384 drivers/gpio/gpio-gpio-mm.o
 10790    5008     832   16630   40f6 drivers/gpio/gpio-104-dio-48e.o
  8853    5152    1408   15413   3c35 linux/drivers/gpio/gpio-104-idi-48.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpio/gpio-104-dio-48e.c | 2 +-
 drivers/gpio/gpio-104-idi-48.c  | 2 +-
 drivers/gpio/gpio-gpio-mm.c     | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
index 31e22c93e844..9c4e07fcb74b 100644
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -188,7 +188,7 @@ static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 {
 	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
 	size_t i;
-	const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
 	const unsigned int gpio_reg_size = 8;
 	unsigned int bits_offset;
 	size_t word_index;
diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index f35632609379..2c9738adb3a6 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -94,7 +94,7 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 {
 	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
 	size_t i;
-	const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
 	const unsigned int gpio_reg_size = 8;
 	unsigned int bits_offset;
 	size_t word_index;
diff --git a/drivers/gpio/gpio-gpio-mm.c b/drivers/gpio/gpio-gpio-mm.c
index d496cc56c2a2..b56ff2efbf36 100644
--- a/drivers/gpio/gpio-gpio-mm.c
+++ b/drivers/gpio/gpio-gpio-mm.c
@@ -177,7 +177,7 @@ static int gpiomm_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 {
 	struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip);
 	size_t i;
-	const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+	static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
 	const unsigned int gpio_reg_size = 8;
 	unsigned int bits_offset;
 	size_t word_index;
-- 
2.17.0

Re: [PATCH] gpio: make several const arrays static, shrinks object size

[William Breathitt Gray]

On Wed, Apr 18, 2018 at 06:26:34PM +0100, Colin King wrote:
>From: Colin Ian King <colin.king@canonical.com>
>
>Don't populate the const read-only arrays 'port' on the stack but
>instead make them static. Makes the object code smaller:
>
>Before:
>  text    data     bss     dec    hex filename
>  8542    4088     672   13302   33f6 drivers/gpio/gpio-gpio-mm.o
> 10959    4952     832   16743   4167 drivers/gpio/gpio-104-dio-48e.o
>  9022    5064    1408   15494   3c86 drivers/gpio/gpio-104-idi-48.o
>
>After:
>  text    data     bss     dec    hex filename
>  8372    4144     672   13188   3384 drivers/gpio/gpio-gpio-mm.o
> 10790    5008     832   16630   40f6 drivers/gpio/gpio-104-dio-48e.o
>  8853    5152    1408   15413   3c35 linux/drivers/gpio/gpio-104-idi-48.o
>
>(gcc version 7.2.0 x86_64)
>
>Signed-off-by: Colin Ian King <colin.king@canonical.com>

Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>

Re: [PATCH] gpio: make several const arrays static, shrinks object size

[Linus Walleij]

On Wed, Apr 18, 2018 at 7:26 PM, Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
>
> Don't populate the const read-only arrays 'port' on the stack but
> instead make them static. Makes the object code smaller:
>
> Before:
>   text    data     bss     dec    hex filename
>   8542    4088     672   13302   33f6 drivers/gpio/gpio-gpio-mm.o
>  10959    4952     832   16743   4167 drivers/gpio/gpio-104-dio-48e.o
>   9022    5064    1408   15494   3c86 drivers/gpio/gpio-104-idi-48.o
>
> After:
>   text    data     bss     dec    hex filename
>   8372    4144     672   13188   3384 drivers/gpio/gpio-gpio-mm.o
>  10790    5008     832   16630   40f6 drivers/gpio/gpio-104-dio-48e.o
>   8853    5152    1408   15413   3c35 linux/drivers/gpio/gpio-104-idi-48.o
>
> (gcc version 7.2.0 x86_64)
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

I had already applied some part of the patch.

Dropped patches to one file for this reason.

Please check the result.

Patch applied!

Yours,
Linus Walleij