Re: [PATCH v2 1/2] MIPS: Loongson: Cleanup cpu_hwmon.c
From: Tiezhu Yang
Date: Sat May 09 2020 - 06:28:43 EST
On 05/09/2020 05:52 PM, Huacai Chen wrote:
Hi, Tiezhu,
On Sat, May 9, 2020 at 3:13 PM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
Fix the following checkpatch warnings and errors:
ERROR: do not initialise statics to 0
#14: FILE: drivers/platform/mips/cpu_hwmon.c:14:
+static int csr_temp_enable = 0;
I know you are doing things by checkpatch, but I really don't know why
not initialise. I think initialise is more human-readable.
Hi Huacai,
Just for cleanup. I think the reason may be:
The static variables are initialised to 0 by GCC.
Explicit initialization is not necessary.
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#60: FILE: drivers/platform/mips/cpu_hwmon.c:60:
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
And so does this.
The generic reason is octal is readable and S_<FOO> is unintelligible.
Here is Linus' opinion:
https://lkml.org/lkml/2016/8/2/1945
Thanks,
Tiezhu Yang
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#84: FILE: drivers/platform/mips/cpu_hwmon.c:84:
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#85: FILE: drivers/platform/mips/cpu_hwmon.c:85:
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#86: FILE: drivers/platform/mips/cpu_hwmon.c:86:
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#87: FILE: drivers/platform/mips/cpu_hwmon.c:87:
+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#88: FILE: drivers/platform/mips/cpu_hwmon.c:88:
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#89: FILE: drivers/platform/mips/cpu_hwmon.c:89:
+static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#90: FILE: drivers/platform/mips/cpu_hwmon.c:90:
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#91: FILE: drivers/platform/mips/cpu_hwmon.c:91:
+static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
WARNING: Missing a blank line after declarations
#120: FILE: drivers/platform/mips/cpu_hwmon.c:120:
+ int id = (to_sensor_dev_attr(attr))->index - 1;
+ return sprintf(buf, "CPU %d Temperature\n", id);
WARNING: Missing a blank line after declarations
#128: FILE: drivers/platform/mips/cpu_hwmon.c:128:
+ int value = loongson3_cpu_temp(id);
+ return sprintf(buf, "%d\n", value);
ERROR: spaces required around that '=' (ctx:VxV)
#135: FILE: drivers/platform/mips/cpu_hwmon.c:135:
+ for (i=0; i<nr_packages; i++)
^
ERROR: spaces required around that '<' (ctx:VxV)
#135: FILE: drivers/platform/mips/cpu_hwmon.c:135:
+ for (i=0; i<nr_packages; i++)
^
ERROR: spaces required around that '=' (ctx:VxV)
#145: FILE: drivers/platform/mips/cpu_hwmon.c:145:
+ for (i=0; i<nr_packages; i++)
^
ERROR: spaces required around that '<' (ctx:VxV)
#145: FILE: drivers/platform/mips/cpu_hwmon.c:145:
+ for (i=0; i<nr_packages; i++)
^
ERROR: spaces required around that '=' (ctx:VxV)
#156: FILE: drivers/platform/mips/cpu_hwmon.c:156:
+ for (i=0; i<nr_packages; i++) {
^
ERROR: spaces required around that '<' (ctx:VxV)
#156: FILE: drivers/platform/mips/cpu_hwmon.c:156:
+ for (i=0; i<nr_packages; i++) {
^
WARNING: line over 80 characters
#175: FILE: drivers/platform/mips/cpu_hwmon.c:175:
+ csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_TEMP;
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
drivers/platform/mips/cpu_hwmon.c | 33 ++++++++++++++++++---------------
1 file changed, 18 insertions(+), 15 deletions(-)
diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c
index 0d27cb7..fa42b13 100644
--- a/drivers/platform/mips/cpu_hwmon.c
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -11,7 +11,7 @@
#include <loongson_hwmon.h>
#include <loongson_regs.h>
-static int csr_temp_enable = 0;
+static int csr_temp_enable;
/*
* Loongson-3 series cpu has two sensors inside,
@@ -44,7 +44,7 @@ int loongson3_cpu_temp(int cpu)
case PRID_REV_LOONGSON3A_R3_0:
case PRID_REV_LOONGSON3A_R3_1:
default:
- reg = (reg & 0xffff)*731/0x4000 - 273;
+ reg = (reg & 0xffff) * 731 / 0x4000 - 273;
break;
}
@@ -57,7 +57,7 @@ static struct device *cpu_hwmon_dev;
static ssize_t get_hwmon_name(struct device *dev,
struct device_attribute *attr, char *buf);
-static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
+static SENSOR_DEVICE_ATTR(name, 0444, get_hwmon_name, NULL, 0);
static struct attribute *cpu_hwmon_attributes[] = {
&sensor_dev_attr_name.dev_attr.attr,
@@ -81,14 +81,14 @@ static ssize_t get_cpu_temp(struct device *dev,
static ssize_t cpu_temp_label(struct device *dev,
struct device_attribute *attr, char *buf);
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
-static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
-static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
-static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
-static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
-static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
-static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
-static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4);
static const struct attribute *hwmon_cputemp[4][3] = {
{
@@ -117,6 +117,7 @@ static ssize_t cpu_temp_label(struct device *dev,
struct device_attribute *attr, char *buf)
{
int id = (to_sensor_dev_attr(attr))->index - 1;
+
return sprintf(buf, "CPU %d Temperature\n", id);
}
@@ -125,6 +126,7 @@ static ssize_t get_cpu_temp(struct device *dev,
{
int id = (to_sensor_dev_attr(attr))->index - 1;
int value = loongson3_cpu_temp(id);
+
return sprintf(buf, "%d\n", value);
}
@@ -132,7 +134,7 @@ static int create_sysfs_cputemp_files(struct kobject *kobj)
{
int i, ret = 0;
- for (i=0; i<nr_packages; i++)
+ for (i = 0; i < nr_packages; i++)
ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
return ret;
@@ -142,7 +144,7 @@ static void remove_sysfs_cputemp_files(struct kobject *kobj)
{
int i;
- for (i=0; i<nr_packages; i++)
+ for (i = 0; i < nr_packages; i++)
sysfs_remove_files(kobj, hwmon_cputemp[i]);
}
@@ -153,7 +155,7 @@ static void do_thermal_timer(struct work_struct *work)
{
int i, value, temp_max = 0;
- for (i=0; i<nr_packages; i++) {
+ for (i = 0; i < nr_packages; i++) {
value = loongson3_cpu_temp(i);
if (value > temp_max)
temp_max = value;
@@ -172,7 +174,8 @@ static int __init loongson_hwmon_init(void)
pr_info("Loongson Hwmon Enter...\n");
if (cpu_has_csr())
- csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_TEMP;
+ csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
+ LOONGSON_CSRF_TEMP;
cpu_hwmon_dev = hwmon_device_register(NULL);
if (IS_ERR(cpu_hwmon_dev)) {
--
2.1.0