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Message-Id: <20240722084149.13076-1-luoxueqin@kylinos.cn>
Date: Mon, 22 Jul 2024 16:41:49 +0800
From: xueqin Luo <luoxueqin@...inos.cn>
To: rafael@...nel.org,
pavel@....cz,
len.brown@...el.com
Cc: linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
xiongxin@...inos.cn,
Xueqin Luo <luoxueqin@...inos.cn>
Subject: [PATCH -next] PM: Use sysfs_emit() and sysfs_emit_at() in "show" functions
From: Xueqin Luo <luoxueqin@...inos.cn>
As Documentation/filesystems/sysfs.rst suggested,
show() should only use sysfs_emit() or sysfs_emit_at() when formatting
the value to be returned to user space.
No functional change intended.
Signed-off-by: Xueqin Luo <luoxueqin@...inos.cn>
---
kernel/power/main.c | 70 ++++++++++++++++++++++-----------------------
1 file changed, 35 insertions(+), 35 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c
index a9e0693aaf69..4ea4e2fa4da7 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -115,7 +115,7 @@ int pm_async_enabled = 1;
static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- return sprintf(buf, "%d\n", pm_async_enabled);
+ return sysfs_emit(buf, "%d\n", pm_async_enabled);
}
static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -139,8 +139,8 @@ power_attr(pm_async);
static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- char *s = buf;
suspend_state_t i;
+ ssize_t sz = 0;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) {
if (i >= PM_SUSPEND_MEM && cxl_mem_active())
@@ -149,17 +149,17 @@ static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
const char *label = mem_sleep_states[i];
if (mem_sleep_current == i)
- s += sprintf(s, "[%s] ", label);
+ sz += sysfs_emit_at(buf, sz, "[%s] ", label);
else
- s += sprintf(s, "%s ", label);
+ sz += sysfs_emit_at(buf, sz, "%s ", label);
}
}
/* Convert the last space to a newline if needed. */
- if (s != buf)
- *(s-1) = '\n';
+ if (sz)
+ sz += sysfs_emit_at(buf, sz, "\n");
- return (s - buf);
+ return sz;
}
static suspend_state_t decode_suspend_state(const char *buf, size_t n)
@@ -220,7 +220,7 @@ bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC);
static ssize_t sync_on_suspend_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", sync_on_suspend_enabled);
+ return sysfs_emit(buf, "%d\n", sync_on_suspend_enabled);
}
static ssize_t sync_on_suspend_store(struct kobject *kobj,
@@ -257,22 +257,22 @@ static const char * const pm_tests[__TEST_AFTER_LAST] = {
static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- char *s = buf;
int level;
+ size_t sz = 0;
for (level = TEST_FIRST; level <= TEST_MAX; level++)
if (pm_tests[level]) {
if (level == pm_test_level)
- s += sprintf(s, "[%s] ", pm_tests[level]);
+ sz += sysfs_emit_at(buf, sz, "[%s] ", pm_tests[level]);
else
- s += sprintf(s, "%s ", pm_tests[level]);
+ sz += sysfs_emit_at(buf, sz, "%s ", pm_tests[level]);
}
- if (s != buf)
+ if (sz)
/* convert the last space to a newline */
- *(s-1) = '\n';
+ sz += sysfs_emit_at(buf, sz, "\n");
- return (s - buf);
+ return sz;
}
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -390,7 +390,7 @@ static const char * const suspend_step_names[] = {
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
- return sprintf(buf, format_str, suspend_stats._name); \
+ return sysfs_emit(buf, format_str, suspend_stats._name); \
} \
static struct kobj_attribute _name = __ATTR_RO(_name)
@@ -404,7 +404,7 @@ suspend_attr(max_hw_sleep, "%llu\n");
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
- return sprintf(buf, "%u\n", \
+ return sysfs_emit(buf, "%u\n", \
suspend_stats.step_failures[step-1]); \
} \
static struct kobj_attribute _name = __ATTR_RO(_name)
@@ -428,7 +428,7 @@ static ssize_t last_failed_dev_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
last_failed_dev = suspend_stats.failed_devs[index];
- return sprintf(buf, "%s\n", last_failed_dev);
+ return sysfs_emit(buf, "%s\n", last_failed_dev);
}
static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev);
@@ -442,7 +442,7 @@ static ssize_t last_failed_errno_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
last_failed_errno = suspend_stats.errno[index];
- return sprintf(buf, "%d\n", last_failed_errno);
+ return sysfs_emit(buf, "%d\n", last_failed_errno);
}
static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno);
@@ -456,7 +456,7 @@ static ssize_t last_failed_step_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
step = suspend_stats.failed_steps[index];
- return sprintf(buf, "%s\n", suspend_step_names[step]);
+ return sysfs_emit(buf, "%s\n", suspend_step_names[step]);
}
static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step);
@@ -571,7 +571,7 @@ bool pm_print_times_enabled;
static ssize_t pm_print_times_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", pm_print_times_enabled);
+ return sysfs_emit(buf, "%d\n", pm_print_times_enabled);
}
static ssize_t pm_print_times_store(struct kobject *kobj,
@@ -604,7 +604,7 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
if (!pm_wakeup_irq())
return -ENODATA;
- return sprintf(buf, "%u\n", pm_wakeup_irq());
+ return sysfs_emit(buf, "%u\n", pm_wakeup_irq());
}
power_attr_ro(pm_wakeup_irq);
@@ -620,7 +620,7 @@ EXPORT_SYMBOL_GPL(pm_debug_messages_should_print);
static ssize_t pm_debug_messages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", pm_debug_messages_on);
+ return sysfs_emit(buf, "%d\n", pm_debug_messages_on);
}
static ssize_t pm_debug_messages_store(struct kobject *kobj,
@@ -668,21 +668,21 @@ struct kobject *power_kobj;
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- char *s = buf;
+ ssize_t sz = 0;
#ifdef CONFIG_SUSPEND
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
if (pm_states[i])
- s += sprintf(s,"%s ", pm_states[i]);
+ sz += sysfs_emit_at(buf, sz, "%s ", pm_states[i]);
#endif
if (hibernation_available())
- s += sprintf(s, "disk ");
- if (s != buf)
+ sz += sysfs_emit_at(buf, sz, "disk ");
+ if (sz)
/* convert the last space to a newline */
- *(s-1) = '\n';
- return (s - buf);
+ sz += sysfs_emit_at(buf, sz, "\n");
+ return sz;
}
static suspend_state_t decode_state(const char *buf, size_t n)
@@ -782,7 +782,7 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
unsigned int val;
return pm_get_wakeup_count(&val, true) ?
- sprintf(buf, "%u\n", val) : -EINTR;
+ sysfs_emit(buf, "%u\n", val) : -EINTR;
}
static ssize_t wakeup_count_store(struct kobject *kobj,
@@ -824,17 +824,17 @@ static ssize_t autosleep_show(struct kobject *kobj,
suspend_state_t state = pm_autosleep_state();
if (state == PM_SUSPEND_ON)
- return sprintf(buf, "off\n");
+ return sysfs_emit(buf, "off\n");
#ifdef CONFIG_SUSPEND
if (state < PM_SUSPEND_MAX)
- return sprintf(buf, "%s\n", pm_states[state] ?
+ return sysfs_emit(buf, "%s\n", pm_states[state] ?
pm_states[state] : "error");
#endif
#ifdef CONFIG_HIBERNATION
- return sprintf(buf, "disk\n");
+ return sysfs_emit(buf, "disk\n");
#else
- return sprintf(buf, "error");
+ return sysfs_emit(buf, "error\n");
#endif
}
@@ -903,7 +903,7 @@ int pm_trace_enabled;
static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- return sprintf(buf, "%d\n", pm_trace_enabled);
+ return sysfs_emit(buf, "%d\n", pm_trace_enabled);
}
static ssize_t
@@ -940,7 +940,7 @@ power_attr_ro(pm_trace_dev_match);
static ssize_t pm_freeze_timeout_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%u\n", freeze_timeout_msecs);
+ return sysfs_emit(buf, "%u\n", freeze_timeout_msecs);
}
static ssize_t pm_freeze_timeout_store(struct kobject *kobj,
--
2.25.1
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