From: Gustavo A. R. Silva Date: Tue, 11 Jul 2017 18:15:19 +0000 (-0500) Subject: pinctrl: st: constify gpio_chip structure X-Git-Tag: v4.14-rc1~142^2~80 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fe4f86affd43076b2b28da6eaf9341428ae94787;p=platform%2Fkernel%2Flinux-rpi.git pinctrl: st: 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 21671 3632 128 25431 6357 drivers/pinctrl/pinctrl-st.o after: text data bss dec hex filename 21366 3576 128 25070 61ee drivers/pinctrl/pinctrl-st.o Signed-off-by: Gustavo A. R. Silva Acked-by: Patrice Chotard Signed-off-by: Linus Walleij --- diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c index 3ae8066..5d4789d 100644 --- a/drivers/pinctrl/pinctrl-st.c +++ b/drivers/pinctrl/pinctrl-st.c @@ -1442,7 +1442,7 @@ static void st_gpio_irqmux_handler(struct irq_desc *desc) chained_irq_exit(chip, desc); } -static struct gpio_chip st_gpio_template = { +static const struct gpio_chip st_gpio_template = { .request = gpiochip_generic_request, .free = gpiochip_generic_free, .get = st_gpio_get,