From: Gustavo A. R. Silva <garsilva@embeddedor.com>
Date: Tue, 11 Jul 2017 18:22:37 +0000 (-0500)
Subject: pinctrl: rza1: constify gpio_chip structure
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fa39210d41dfb96f7612d912e52e308dd74c04c4;p=linux.git
pinctrl: rza1: 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
11866 3520 128 15514 3c9a drivers/pinctrl/pinctrl-rza1.o
after:
text data bss dec hex filename
11539 3464 128 15131 3b1b drivers/pinctrl/pinctrl-rza1.o
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
index dc164da10446f..7e30134b3d186 100644
--- a/drivers/pinctrl/pinctrl-rza1.c
+++ b/drivers/pinctrl/pinctrl-rza1.c
@@ -723,7 +723,7 @@ static void rza1_gpio_set(struct gpio_chip *chip, unsigned int gpio,
rza1_pin_set(port, gpio, value);
}
-static struct gpio_chip rza1_gpiochip_template = {
+static const struct gpio_chip rza1_gpiochip_template = {
.request = rza1_gpio_request,
.free = rza1_gpio_free,
.get_direction = rza1_gpio_get_direction,