From 115fa3fa2792ef4b13110f4459b6041d04542cfd Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Tue, 11 Jul 2017 16:35:19 -0500 Subject: [PATCH] pinctrl: coh901: constify gpio_chip structure This structure is only used to copy into another 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 12775 3696 64 16535 4097 drivers/pinctrl/pinctrl-coh901.o after: bss dec hex filename 12440 3640 64 16144 3f10 drivers/pinctrl/pinctrl-coh901.o Signed-off-by: Gustavo A. R. Silva Signed-off-by: Linus Walleij --- drivers/pinctrl/pinctrl-coh901.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-coh901.c b/drivers/pinctrl/pinctrl-coh901.c index 741b39eaeb8b..ac155e7d3412 100644 --- a/drivers/pinctrl/pinctrl-coh901.c +++ b/drivers/pinctrl/pinctrl-coh901.c @@ -387,7 +387,7 @@ int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset, return 0; } -static struct gpio_chip u300_gpio_chip = { +static const struct gpio_chip u300_gpio_chip = { .label = "u300-gpio-chip", .owner = THIS_MODULE, .request = gpiochip_generic_request,