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