| Message ID | 20170711181519.GA20001@embeddedgus (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Headers | show |
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@embeddedor.com> > --- > 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@st.com> Thanks
Hi Patrice, Quoting Patrice CHOTARD <patrice.chotard@st.com>: > 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@embeddedor.com> >> --- >> 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@st.com> > > Thanks Glad to help. :) Thanks -- Gustavo A. R. Silva
On Tue, Jul 11, 2017 at 8:15 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 > 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@embeddedor.com> Patch applied with Patrice's ACK. Yours, 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,
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@embeddedor.com> --- drivers/pinctrl/pinctrl-st.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)