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Subject[PATCH] media: em28xx: make various arrays static const, makes object smaller
Date
From: Colin Ian King <colin.king@canonical.com>

Don't populate the arrays on the stack but instead make them
static const. Makes the object code smaller by 767 bytes.

Before:
text data bss dec hex filename
41567 15088 192 56847 de0f em28xx/em28xx-dvb.o

After:
text data bss dec hex filename
39872 16016 192 56080 db10 em28xx/em28xx-dvb.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/media/usb/em28xx/em28xx-dvb.c | 30 +++++++++++++--------------
1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index a73faf12f7e4..0ab6c493bc74 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -471,13 +471,13 @@ static void hauppauge_hvr930c_init(struct em28xx *dev)
{
int i;

- struct em28xx_reg_seq hauppauge_hvr930c_init[] = {
+ static const struct em28xx_reg_seq hauppauge_hvr930c_init[] = {
{EM2874_R80_GPIO_P0_CTRL, 0xff, 0xff, 0x65},
{EM2874_R80_GPIO_P0_CTRL, 0xfb, 0xff, 0x32},
{EM2874_R80_GPIO_P0_CTRL, 0xff, 0xff, 0xb8},
{ -1, -1, -1, -1},
};
- struct em28xx_reg_seq hauppauge_hvr930c_end[] = {
+ static const struct em28xx_reg_seq hauppauge_hvr930c_end[] = {
{EM2874_R80_GPIO_P0_CTRL, 0xef, 0xff, 0x01},
{EM2874_R80_GPIO_P0_CTRL, 0xaf, 0xff, 0x65},
{EM2874_R80_GPIO_P0_CTRL, 0xef, 0xff, 0x76},
@@ -493,7 +493,7 @@ static void hauppauge_hvr930c_init(struct em28xx *dev)
{ -1, -1, -1, -1},
};

- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs[] = {
@@ -537,20 +537,20 @@ static void hauppauge_hvr930c_init(struct em28xx *dev)
static void terratec_h5_init(struct em28xx *dev)
{
int i;
- struct em28xx_reg_seq terratec_h5_init[] = {
+ static const struct em28xx_reg_seq terratec_h5_init[] = {
{EM2820_R08_GPIO_CTRL, 0xff, 0xff, 10},
{EM2874_R80_GPIO_P0_CTRL, 0xf6, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xf2, 0xff, 50},
{EM2874_R80_GPIO_P0_CTRL, 0xf6, 0xff, 100},
{ -1, -1, -1, -1},
};
- struct em28xx_reg_seq terratec_h5_end[] = {
+ static const struct em28xx_reg_seq terratec_h5_end[] = {
{EM2874_R80_GPIO_P0_CTRL, 0xe6, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xa6, 0xff, 50},
{EM2874_R80_GPIO_P0_CTRL, 0xe6, 0xff, 100},
{ -1, -1, -1, -1},
};
- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs[] = {
@@ -594,14 +594,14 @@ static void terratec_htc_stick_init(struct em28xx *dev)
* 0xe6: unknown (does not affect DVB-T).
* 0xb6: unknown (does not affect DVB-T).
*/
- struct em28xx_reg_seq terratec_htc_stick_init[] = {
+ static const struct em28xx_reg_seq terratec_htc_stick_init[] = {
{EM2820_R08_GPIO_CTRL, 0xff, 0xff, 10},
{EM2874_R80_GPIO_P0_CTRL, 0xf6, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xe6, 0xff, 50},
{EM2874_R80_GPIO_P0_CTRL, 0xf6, 0xff, 100},
{ -1, -1, -1, -1},
};
- struct em28xx_reg_seq terratec_htc_stick_end[] = {
+ static const struct em28xx_reg_seq terratec_htc_stick_end[] = {
{EM2874_R80_GPIO_P0_CTRL, 0xb6, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xf6, 0xff, 50},
{ -1, -1, -1, -1},
@@ -611,7 +611,7 @@ static void terratec_htc_stick_init(struct em28xx *dev)
* Init the analog decoder (not yet supported), but
* it's probably still a good idea.
*/
- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs[] = {
@@ -642,14 +642,14 @@ static void terratec_htc_usb_xs_init(struct em28xx *dev)
{
int i;

- struct em28xx_reg_seq terratec_htc_usb_xs_init[] = {
+ static const struct em28xx_reg_seq terratec_htc_usb_xs_init[] = {
{EM2820_R08_GPIO_CTRL, 0xff, 0xff, 10},
{EM2874_R80_GPIO_P0_CTRL, 0xb2, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xb2, 0xff, 50},
{EM2874_R80_GPIO_P0_CTRL, 0xb6, 0xff, 100},
{ -1, -1, -1, -1},
};
- struct em28xx_reg_seq terratec_htc_usb_xs_end[] = {
+ static const struct em28xx_reg_seq terratec_htc_usb_xs_end[] = {
{EM2874_R80_GPIO_P0_CTRL, 0xa6, 0xff, 100},
{EM2874_R80_GPIO_P0_CTRL, 0xa6, 0xff, 50},
{EM2874_R80_GPIO_P0_CTRL, 0xe6, 0xff, 100},
@@ -660,7 +660,7 @@ static void terratec_htc_usb_xs_init(struct em28xx *dev)
* Init the analog decoder (not yet supported), but
* it's probably still a good idea.
*/
- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs[] = {
@@ -704,7 +704,7 @@ static void pctv_520e_init(struct em28xx *dev)
* digital demodulator and tuner are routed via AVF4910B.
*/
int i;
- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs[] = {
@@ -800,7 +800,7 @@ static int em28xx_mt352_terratec_xs_init(struct dvb_frontend *fe)
static void px_bcud_init(struct em28xx *dev)
{
int i;
- struct {
+ static const struct {
unsigned char r[4];
int len;
} regs1[] = {
@@ -818,7 +818,7 @@ static void px_bcud_init(struct em28xx *dev)
{{ 0x85, 0x7a }, 2},
{{ 0x87, 0x04 }, 2},
};
- static struct em28xx_reg_seq gpio[] = {
+ static const struct em28xx_reg_seq gpio[] = {
{EM28XX_R06_I2C_CLK, 0x40, 0xff, 300},
{EM2874_R80_GPIO_P0_CTRL, 0xfd, 0xff, 60},
{EM28XX_R15_RGAIN, 0x20, 0xff, 0},
--
2.20.1
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