From: Gustavo A. R. Silva Date: Tue, 11 Jul 2017 18:28:42 +0000 (-0500) Subject: pinctrl: vt8500: wmt: constify gpio_chip structure X-Git-Tag: v4.14-rc1~142^2~98 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=3d9c25634a24926bd5551881fa4485c1c1dcf86e;p=linux.git pinctrl: vt8500: wmt: constify gpio_chip structure This structure is only used to copy into other structure, so declare it as const. This issue was detected using Coccinelle and the following semantic patch: @r disable optional_qualifier@ identifier i; position p; @@ static struct gpio_chip i@p = { ... }; @ok@ identifier r.i; expression e; position p; @@ e = i@p; @bad@ position p != {r.p,ok.p}; identifier r.i; struct gpio_chip e; @@ e@i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct gpio_chip i = { ... }; In the following log you can see a significant difference in the code size and data segment, hence in the dec segment. This log is the output of the size command, before and after the code change: before: text data bss dec hex filename 7754 2328 0 10082 2762 drivers/pinctrl/vt8500/pinctrl-wmt.o after: text data bss dec hex filename 7472 2272 0 9744 2610 drivers/pinctrl/vt8500/pinctrl-wmt.o Signed-off-by: Gustavo A. R. Silva Signed-off-by: Linus Walleij --- diff --git a/drivers/pinctrl/vt8500/pinctrl-wmt.c b/drivers/pinctrl/vt8500/pinctrl-wmt.c index c207e60b734f..974e646b92d1 100644 --- a/drivers/pinctrl/vt8500/pinctrl-wmt.c +++ b/drivers/pinctrl/vt8500/pinctrl-wmt.c @@ -546,7 +546,7 @@ static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset, return pinctrl_gpio_direction_output(chip->base + offset); } -static struct gpio_chip wmt_gpio_chip = { +static const struct gpio_chip wmt_gpio_chip = { .label = "gpio-wmt", .owner = THIS_MODULE, .request = gpiochip_generic_request,