Hi Patrice, Quoting Patrice CHOTARD <patrice.chotard@xxxxxx>:
Hi Gustavo On 07/11/2017 08:15 PM, Gustavo A. R. Silva 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 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 <garsilva@xxxxxxxxxxxxxx> --- drivers/pinctrl/pinctrl-st.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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,Acked-by: Patrice Chotard <patrice.chotard@xxxxxx> Thanks
Glad to help. :) Thanks -- Gustavo A. R. Silva -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
