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Message-ID: <1a1f24707a03c2363e29ef91905e9f206fb6a0b5.camel@perches.com>
Date: Wed, 29 Jun 2022 18:44:14 -0700
From: Joe Perches <joe@...ches.com>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: Kalesh Singh <kaleshsingh@...gle.com>,
Christoph Hellwig <hch@....de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arve Hjønnevåg <arve@...roid.com>,
Todd Kjos <tkjos@...roid.com>,
Martijn Coenen <maco@...roid.com>,
Joel Fernandes <joel@...lfernandes.org>,
Christian Brauner <brauner@...nel.org>,
Hridya Valsaraju <hridya@...gle.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Theodore Ts'o <tytso@....edu>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
"Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
Josh Triplett <josh@...htriplett.org>,
Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Shuah Khan <shuah@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, wireguard@...ts.zx2c4.com,
netdev@...r.kernel.org, rcu <rcu@...r.kernel.org>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@...r.kernel.org>, sultan@...neltoast.com,
android-kernel-team <android-kernel-team@...gle.com>,
John Stultz <jstultz@...gle.com>,
Saravana Kannan <saravanak@...gle.com>, rafael@...nel.org
Subject: Re: [PATCH] remove CONFIG_ANDROID
On Thu, 2022-06-30 at 02:50 +0200, Jason A. Donenfeld wrote:
> On Wed, Jun 29, 2022 at 05:36:57PM -0700, Joe Perches wrote:
> > > > +static ssize_t pm_userspace_autosleeper_show(struct kobject *kobj,
> > > > + struct kobj_attribute *attr, char *buf)
> > > > +{
> > > > + return sprintf(buf, "%d\n", pm_userspace_autosleeper_enabled);
> >
> > This should use sysfs_emit no?
>
> Probably, yea. Note that I just copy and pasted a nearby function,
> pm_async_show, `:%s/`d the variable name, and then promptly `git diff |
> clip`d it and plonked it into my email. Looking at the file, it uses
> sprintf all over the place in this fashion. So you may want to submit a
> cleanup to Rafael on this if you're right about sysfs_emit() being
> universally preferred.
Perhaps:
(trivial refactored and added a missing newline in autosleep_show)
---
kernel/power/main.c | 102 ++++++++++++++++++++++++++--------------------------
1 file changed, 52 insertions(+), 50 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c
index e3694034b7536..c8a030319b15c 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -100,7 +100,7 @@ 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,
@@ -124,27 +124,25 @@ power_attr(pm_async);
static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- char *s = buf;
+ int len = 0;
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) {
if (i >= PM_SUSPEND_MEM && cxl_mem_active())
continue;
- if (mem_sleep_states[i]) {
- const char *label = mem_sleep_states[i];
+ if (!mem_sleep_states[i])
+ continue;
- if (mem_sleep_current == i)
- s += sprintf(s, "[%s] ", label);
- else
- s += sprintf(s, "%s ", label);
- }
+ len += sysfs_emit_at(buf, len,
+ mem_sleep_current == i ? "[%s] " : "%s ",
+ mem_sleep_states[i]);
}
- /* Convert the last space to a newline if needed. */
- if (s != buf)
- *(s-1) = '\n';
+ /* Convert the last space to a newline if needed */
+ if (len)
+ sysfs_emit_at(buf, len - 1, "\n");
- return (s - buf);
+ return len;
}
static suspend_state_t decode_suspend_state(const char *buf, size_t n)
@@ -205,7 +203,7 @@ 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,
@@ -242,22 +240,22 @@ 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 len = 0;
int level;
- for (level = TEST_FIRST; level <= TEST_MAX; level++)
- if (pm_tests[level]) {
- if (level == pm_test_level)
- s += sprintf(s, "[%s] ", pm_tests[level]);
- else
- s += sprintf(s, "%s ", pm_tests[level]);
- }
+ for (level = TEST_FIRST; level <= TEST_MAX; level++) {
+ if (!pm_tests[level])
+ continue;
+ len += sysfs_emit_at(buf, len,
+ level == pm_test_level ? "[%s] " : "%s ",
+ pm_tests[level]);
+ }
- if (s != buf)
- /* convert the last space to a newline */
- *(s-1) = '\n';
+ /* convert the last space to a newline if needed */
+ if (len)
+ sysfs_emit_at(buf, len - 1, "\n");
- return (s - buf);
+ return len;
}
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -314,7 +312,7 @@ static char *suspend_step_name(enum suspend_stat_step step)
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
- return sprintf(buf, "%d\n", suspend_stats._name); \
+ return sysfs_emit(buf, "%d\n", suspend_stats._name); \
} \
static struct kobj_attribute _name = __ATTR_RO(_name)
@@ -339,7 +337,7 @@ 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);
@@ -353,7 +351,7 @@ 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);
@@ -369,7 +367,7 @@ static ssize_t last_failed_step_show(struct kobject *kobj,
step = suspend_stats.failed_steps[index];
last_failed_step = suspend_step_name(step);
- return sprintf(buf, "%s\n", last_failed_step);
+ return sysfs_emit(buf, "%s\n", last_failed_step);
}
static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step);
@@ -477,7 +475,7 @@ 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,
@@ -510,7 +508,7 @@ 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);
@@ -520,7 +518,7 @@ bool pm_debug_messages_on __read_mostly;
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,
@@ -568,21 +566,24 @@ struct kobject *power_kobj;
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- char *s = buf;
+ int len = 0;
#ifdef CONFIG_SUSPEND
suspend_state_t i;
- for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
+ for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i])
- s += sprintf(s,"%s ", pm_states[i]);
+ len += sysfs_emit_at(buf, len, "%s ", pm_states[i]);
+ }
#endif
if (hibernation_available())
- s += sprintf(s, "disk ");
- if (s != buf)
- /* convert the last space to a newline */
- *(s-1) = '\n';
- return (s - buf);
+ len += sysfs_emit_at(buf, len, "disk ");
+
+ /* convert the last space to a newline if needed */
+ if (len)
+ sysfs_emit_at(buf, len - 1, "\n");
+
+ return len;
}
static suspend_state_t decode_state(const char *buf, size_t n)
@@ -681,8 +682,10 @@ 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;
+ if (!pm_get_wakeup_count(&val, true))
+ return -EINTR;
+
+ return sysfs_emit(buf, "%u\n", val);
}
static ssize_t wakeup_count_store(struct kobject *kobj,
@@ -724,17 +727,16 @@ 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] ?
- pm_states[state] : "error");
+ return sysfs_emit(buf, "%s\n", 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
}
@@ -803,7 +805,7 @@ 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
@@ -840,7 +842,7 @@ 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,
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