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Groups > linux.kernel > #1685274 > unrolled thread
| Started by | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| First post | 2017-07-11 20:20 +0200 |
| Last post | 2017-07-12 19:00 +0200 |
| Articles | 3 — 2 participants |
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[PATCH] pinctrl: st: constify gpio_chip structure "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-07-11 20:20 +0200
Re: [PATCH] pinctrl: st: constify gpio_chip structure Patrice CHOTARD <patrice.chotard@st.com> - 2017-07-12 09:10 +0200
Re: [PATCH] pinctrl: st: constify gpio_chip structure "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-07-12 19:00 +0200
| From | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| Date | 2017-07-11 20:20 +0200 |
| Subject | [PATCH] pinctrl: st: constify gpio_chip structure |
| Message-ID | <u27Vp-5Hk-11@gated-at.bofh.it> |
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,
--
2.5.0
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| From | Patrice CHOTARD <patrice.chotard@st.com> |
|---|---|
| Date | 2017-07-12 09:10 +0200 |
| Message-ID | <u2jWx-53w-11@gated-at.bofh.it> |
| In reply to | #1685274 |
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
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| From | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| Date | 2017-07-12 19:00 +0200 |
| Message-ID | <u2t9w-2g2-3@gated-at.bofh.it> |
| In reply to | #1685555 |
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
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