mm: cleanup kstrto*() usage

Range checks can folded into proper conversion function.  kstrto*() exist
for all arithmetic types.

Link: https://lkml.kernel.org/r/20201122123759.GC92364@localhost.localdomainSigned-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/khugepaged.c

@@ -133,11 +133,11 @@ static ssize_t scan_sleep_millisecs_store(struct kobject *kobj,
 					  struct kobj_attribute *attr,
 					  const char *buf, size_t count)
 {
-	unsigned long msecs;
+	unsigned int msecs;
 	int err;
 
-	err = kstrtoul(buf, 10, &msecs);
-	if (err || msecs > UINT_MAX)
+	err = kstrtouint(buf, 10, &msecs);
+	if (err)
 		return -EINVAL;
 
 	khugepaged_scan_sleep_millisecs = msecs;
@@ -161,11 +161,11 @@ static ssize_t alloc_sleep_millisecs_store(struct kobject *kobj,
 					   struct kobj_attribute *attr,
 					   const char *buf, size_t count)
 {
-	unsigned long msecs;
+	unsigned int msecs;
 	int err;
 
-	err = kstrtoul(buf, 10, &msecs);
-	if (err || msecs > UINT_MAX)
+	err = kstrtouint(buf, 10, &msecs);
+	if (err)
 		return -EINVAL;
 
 	khugepaged_alloc_sleep_millisecs = msecs;
@@ -188,11 +188,11 @@ static ssize_t pages_to_scan_store(struct kobject *kobj,
 				   struct kobj_attribute *attr,
 				   const char *buf, size_t count)
 {
+	unsigned int pages;
 	int err;
-	unsigned long pages;
 
-	err = kstrtoul(buf, 10, &pages);
-	if (err || !pages || pages > UINT_MAX)
+	err = kstrtouint(buf, 10, &pages);
+	if (err || !pages)
 		return -EINVAL;
 
 	khugepaged_pages_to_scan = pages;

mm/ksm.c

@@ -2840,11 +2840,11 @@ static ssize_t sleep_millisecs_store(struct kobject *kobj,
 				     struct kobj_attribute *attr,
 				     const char *buf, size_t count)
 {
-	unsigned long msecs;
+	unsigned int msecs;
 	int err;
 
-	err = kstrtoul(buf, 10, &msecs);
-	if (err || msecs > UINT_MAX)
+	err = kstrtouint(buf, 10, &msecs);
+	if (err)
 		return -EINVAL;
 
 	ksm_thread_sleep_millisecs = msecs;
@@ -2864,11 +2864,11 @@ static ssize_t pages_to_scan_store(struct kobject *kobj,
 				   struct kobj_attribute *attr,
 				   const char *buf, size_t count)
 {
+	unsigned int nr_pages;
 	int err;
-	unsigned long nr_pages;
 
-	err = kstrtoul(buf, 10, &nr_pages);
-	if (err || nr_pages > UINT_MAX)
+	err = kstrtouint(buf, 10, &nr_pages);
+	if (err)
 		return -EINVAL;
 
 	ksm_thread_pages_to_scan = nr_pages;
@@ -2886,11 +2886,11 @@ static ssize_t run_show(struct kobject *kobj, struct kobj_attribute *attr,
 static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
 			 const char *buf, size_t count)
 {
+	unsigned int flags;
 	int err;
-	unsigned long flags;
 
-	err = kstrtoul(buf, 10, &flags);
-	if (err || flags > UINT_MAX)
+	err = kstrtouint(buf, 10, &flags);
+	if (err)
 		return -EINVAL;
 	if (flags > KSM_RUN_UNMERGE)
 		return -EINVAL;