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authorGustavo A. R. Silva <garsilva@embeddedor.com>2017-07-11 21:03:39 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-08-14 16:01:01 +0300
commit531bcf73083ac9ba01b2c2443429de6cd7e0ed69 (patch)
treeadaf70be0f4e9b0fa0832b5252290b78251ae1d9 /drivers/pinctrl/bcm
parent6c2c9bd27cc50037e293526c962d5280c84fc913 (diff)
downloadlinux-531bcf73083ac9ba01b2c2443429de6cd7e0ed69.tar.xz
pinctrl: bcm2835: 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 18958 9000 128 28086 6db6 drivers/pinctrl/bcm/pinctrl-bcm2835.o after: text data bss dec hex filename 18764 8912 128 27804 6c9c drivers/pinctrl/bcm/pinctrl-bcm2835.o Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Acked-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/bcm')
-rw-r--r--drivers/pinctrl/bcm/pinctrl-bcm2835.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index 230883168e99..7203f35a2680 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -353,7 +353,7 @@ static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
return pinctrl_gpio_direction_output(chip->base + offset);
}
-static struct gpio_chip bcm2835_gpio_chip = {
+static const struct gpio_chip bcm2835_gpio_chip = {
.label = MODULE_NAME,
.owner = THIS_MODULE,
.request = gpiochip_generic_request,