linux-kernel - [PATCH] macintosh: windfarm_smu_sensors: constify wf_sensor

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Date:   Sun, 29 Jan 2017 22:56:28 +0530
From:   Bhumika Goyal <bhumirks@...il.com>
To:     julia.lawall@...6.fr, benh@...nel.crashing.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Bhumika Goyal <bhumirks@...il.com>
Subject: [PATCH] macintosh: windfarm_smu_sensors: constify wf_sensor_ops structures

Declare wf_sensor_ops structures as const as they are only stored in the
ops field of a wf_sensor structure. This field is of type const, so
wf_sensor_ops structures having this property can be made const too.
Done using Coccinelle:

@r disable optional_qualifier@
identifier x;
position p;
@@
static struct wf_sensor_ops x@......};

@ok@
struct smu_ad_sensor ads;
struct smu_cpu_power_sensor pow;
identifier r.x;
position p;
@@
(
ads.sens.ops=&x@p;
|
pow.sens.ops=&x@p;
)

@bad@
position p != {r.p,ok.p};
identifier r.x;
@@
x@p

@depends on !bad disable optional_qualifier@
identifier r.x;
@@
+const
struct wf_sensor_ops x;

Size details after cross compiling the .o file for powerpc architecture.
File size before:
 text	   data	    bss	    dec	    hex	filename
   3700	    408	     48	   4156	   103c	macintosh/windfarm_smu_sensors.o

File size after:
 text	   data	    bss	    dec	    hex	filename
   3832	    288	     48	   4168	   1048	macintosh/windfarm_smu_sensors.o

Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
---
 drivers/macintosh/windfarm_smu_sensors.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/macintosh/windfarm_smu_sensors.c b/drivers/macintosh/windfarm_smu_sensors.c
index 1cc4e49..172fd26 100644
--- a/drivers/macintosh/windfarm_smu_sensors.c
+++ b/drivers/macintosh/windfarm_smu_sensors.c
@@ -172,22 +172,22 @@ static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
 }
 
 
-static struct wf_sensor_ops smu_cputemp_ops = {
+static const struct wf_sensor_ops smu_cputemp_ops = {
 	.get_value	= smu_cputemp_get,
 	.release	= smu_ads_release,
 	.owner		= THIS_MODULE,
 };
-static struct wf_sensor_ops smu_cpuamp_ops = {
+static const struct wf_sensor_ops smu_cpuamp_ops = {
 	.get_value	= smu_cpuamp_get,
 	.release	= smu_ads_release,
 	.owner		= THIS_MODULE,
 };
-static struct wf_sensor_ops smu_cpuvolt_ops = {
+static const struct wf_sensor_ops smu_cpuvolt_ops = {
 	.get_value	= smu_cpuvolt_get,
 	.release	= smu_ads_release,
 	.owner		= THIS_MODULE,
 };
-static struct wf_sensor_ops smu_slotspow_ops = {
+static const struct wf_sensor_ops smu_slotspow_ops = {
 	.get_value	= smu_slotspow_get,
 	.release	= smu_ads_release,
 	.owner		= THIS_MODULE,
@@ -327,7 +327,7 @@ static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
 	return 0;
 }
 
-static struct wf_sensor_ops smu_cpu_power_ops = {
+static const struct wf_sensor_ops smu_cpu_power_ops = {
 	.get_value	= smu_cpu_power_get,
 	.release	= smu_cpu_power_release,
 	.owner		= THIS_MODULE,
-- 
2.7.4