[PATCH 3/3] iio: common: ssp_sensors: gyro: constify iio_info structures

From: Julia Lawall
Date: Fri Sep 16 2016 - 07:14:13 EST


Check for iio_info structures that are only stored in the info field of a
iio_dev structure. This field is declared const, so iio_info structures
that have this property can be declared as const also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct iio_info i@p = { ... };

@ok@
identifier r.i;
struct iio_dev e;
position p;
@@
e.info = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct iio_info e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct iio_info i = { ... };
// </smpl>

The result of size on this file before the change is:
text data bss dec hex filename
1245 344 0 1589 635
drivers/iio/gyro/ssp_gyro_sensor.o

and after the change it is:
text data bss dec hex filename
1397 192 0 1589 635
drivers/iio/gyro/ssp_gyro_sensor.o

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>

---
drivers/iio/gyro/ssp_gyro_sensor.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/gyro/ssp_gyro_sensor.c b/drivers/iio/gyro/ssp_gyro_sensor.c
index 0a8afdd..1f25f40 100644
--- a/drivers/iio/gyro/ssp_gyro_sensor.c
+++ b/drivers/iio/gyro/ssp_gyro_sensor.c
@@ -74,7 +74,7 @@ static int ssp_gyro_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
}

-static struct iio_info ssp_gyro_iio_info = {
+static const struct iio_info ssp_gyro_iio_info = {
.read_raw = &ssp_gyro_read_raw,
.write_raw = &ssp_gyro_write_raw,
};