linux-kernel - [PATCH v2 1/2] PM: hibernate: Use sysfs_emit() and sysfs_emit

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Message-Id: <20240731024518.126716-2-luoxueqin@kylinos.cn>
Date: Wed, 31 Jul 2024 10:45:17 +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 v2 1/2] PM: hibernate: 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/hibernate.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 0a213f69a9e4..0792d3a85e94 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -1124,10 +1124,10 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
 			 char *buf)
 {
 	int i;
-	char *start = buf;
+	ssize_t sz = 0;
 
 	if (!hibernation_available())
-		return sprintf(buf, "[disabled]\n");
+		return sysfs_emit(buf, "[disabled]\n");
 
 	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
 		if (!hibernation_modes[i])
@@ -1147,12 +1147,12 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
 			continue;
 		}
 		if (i == hibernation_mode)
-			buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
+			sz += sysfs_emit_at(buf, sz, "[%s] ", hibernation_modes[i]);
 		else
-			buf += sprintf(buf, "%s ", hibernation_modes[i]);
+			sz += sysfs_emit_at(buf, sz, "%s ", hibernation_modes[i]);
 	}
-	buf += sprintf(buf, "\n");
-	return buf-start;
+	sz += sysfs_emit_at(buf, sz, "\n");
+	return sz;
 }
 
 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -1210,8 +1210,8 @@ power_attr(disk);
 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
 			   char *buf)
 {
-	return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
-		       MINOR(swsusp_resume_device));
+	return sysfs_emit(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
+			  MINOR(swsusp_resume_device));
 }
 
 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -1270,7 +1270,7 @@ power_attr(resume);
 static ssize_t resume_offset_show(struct kobject *kobj,
 				  struct kobj_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
 }
 
 static ssize_t resume_offset_store(struct kobject *kobj,
@@ -1293,7 +1293,7 @@ power_attr(resume_offset);
 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
 			       char *buf)
 {
-	return sprintf(buf, "%lu\n", image_size);
+	return sysfs_emit(buf, "%lu\n", image_size);
 }
 
 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -1314,7 +1314,7 @@ power_attr(image_size);
 static ssize_t reserved_size_show(struct kobject *kobj,
 				  struct kobj_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%lu\n", reserved_size);
+	return sysfs_emit(buf, "%lu\n", reserved_size);
 }
 
 static ssize_t reserved_size_store(struct kobject *kobj,
-- 
2.25.1