| Message ID | 20170711182842.GA23293@embeddedgus |
|---|---|
| State | New |
| Headers | show |
On Tue, Jul 11, 2017 at 8:28 PM, Gustavo A. R. Silva <garsilva@embeddedor.com> wrote: > 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 <garsilva@embeddedor.com> Patch applied. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pinctrl/vt8500/pinctrl-wmt.c b/drivers/pinctrl/vt8500/pinctrl-wmt.c index c207e60..974e646 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,
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 <garsilva@embeddedor.com> --- drivers/pinctrl/vt8500/pinctrl-wmt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)