mm/damon/sysfs: move unsigned long range directory to common module

The implementation of unsigned long type range directories can be reused
by multiple DAMON sysfs directories including those for DAMON-based
Operation Schemes and the range of number of monitoring regions.  Move the
code into the files for DAMON sysfs common logics.

Link: https://lkml.kernel.org/r/20221026225943.100429-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/sysfs-common.c

@@ -5,7 +5,103 @@
  * Author: SeongJae Park <sj@kernel.org>
  */
 
+#include <linux/slab.h>
+
 #include "sysfs-common.h"
 
 DEFINE_MUTEX(damon_sysfs_lock);
 
+/*
+ * unsigned long range directory
+ */
+
+struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
+		unsigned long min,
+		unsigned long max)
+{
+	struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range),
+			GFP_KERNEL);
+
+	if (!range)
+		return NULL;
+	range->kobj = (struct kobject){};
+	range->min = min;
+	range->max = max;
+
+	return range;
+}
+
+static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr,
+		char *buf)
+{
+	struct damon_sysfs_ul_range *range = container_of(kobj,
+			struct damon_sysfs_ul_range, kobj);
+
+	return sysfs_emit(buf, "%lu\n", range->min);
+}
+
+static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct damon_sysfs_ul_range *range = container_of(kobj,
+			struct damon_sysfs_ul_range, kobj);
+	unsigned long min;
+	int err;
+
+	err = kstrtoul(buf, 0, &min);
+	if (err)
+		return err;
+
+	range->min = min;
+	return count;
+}
+
+static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr,
+		char *buf)
+{
+	struct damon_sysfs_ul_range *range = container_of(kobj,
+			struct damon_sysfs_ul_range, kobj);
+
+	return sysfs_emit(buf, "%lu\n", range->max);
+}
+
+static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct damon_sysfs_ul_range *range = container_of(kobj,
+			struct damon_sysfs_ul_range, kobj);
+	unsigned long max;
+	int err;
+
+	err = kstrtoul(buf, 0, &max);
+	if (err)
+		return err;
+
+	range->max = max;
+	return count;
+}
+
+void damon_sysfs_ul_range_release(struct kobject *kobj)
+{
+	kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
+}
+
+static struct kobj_attribute damon_sysfs_ul_range_min_attr =
+		__ATTR_RW_MODE(min, 0600);
+
+static struct kobj_attribute damon_sysfs_ul_range_max_attr =
+		__ATTR_RW_MODE(max, 0600);
+
+static struct attribute *damon_sysfs_ul_range_attrs[] = {
+	&damon_sysfs_ul_range_min_attr.attr,
+	&damon_sysfs_ul_range_max_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
+
+struct kobj_type damon_sysfs_ul_range_ktype = {
+	.release = damon_sysfs_ul_range_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.default_groups = damon_sysfs_ul_range_groups,
+};
+

mm/damon/sysfs-common.h

@@ -9,3 +9,16 @@
 #include <linux/kobject.h>
 
 extern struct mutex damon_sysfs_lock;
+
+struct damon_sysfs_ul_range {
+	struct kobject kobj;
+	unsigned long min;
+	unsigned long max;
+};
+
+struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
+		unsigned long min,
+		unsigned long max);
+void damon_sysfs_ul_range_release(struct kobject *kobj);
+
+extern struct kobj_type damon_sysfs_ul_range_ktype;

mm/damon/sysfs.c

@@ -11,106 +11,6 @@
 
 #include "sysfs-common.h"
 
-/*
- * unsigned long range directory
- */
-
-struct damon_sysfs_ul_range {
-	struct kobject kobj;
-	unsigned long min;
-	unsigned long max;
-};
-
-static struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
-		unsigned long min,
-		unsigned long max)
-{
-	struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range),
-			GFP_KERNEL);
-
-	if (!range)
-		return NULL;
-	range->kobj = (struct kobject){};
-	range->min = min;
-	range->max = max;
-
-	return range;
-}
-
-static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr,
-		char *buf)
-{
-	struct damon_sysfs_ul_range *range = container_of(kobj,
-			struct damon_sysfs_ul_range, kobj);
-
-	return sysfs_emit(buf, "%lu\n", range->min);
-}
-
-static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct damon_sysfs_ul_range *range = container_of(kobj,
-			struct damon_sysfs_ul_range, kobj);
-	unsigned long min;
-	int err;
-
-	err = kstrtoul(buf, 0, &min);
-	if (err)
-		return err;
-
-	range->min = min;
-	return count;
-}
-
-static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr,
-		char *buf)
-{
-	struct damon_sysfs_ul_range *range = container_of(kobj,
-			struct damon_sysfs_ul_range, kobj);
-
-	return sysfs_emit(buf, "%lu\n", range->max);
-}
-
-static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr,
-		const char *buf, size_t count)
-{
-	struct damon_sysfs_ul_range *range = container_of(kobj,
-			struct damon_sysfs_ul_range, kobj);
-	unsigned long max;
-	int err;
-
-	err = kstrtoul(buf, 0, &max);
-	if (err)
-		return err;
-
-	range->max = max;
-	return count;
-}
-
-static void damon_sysfs_ul_range_release(struct kobject *kobj)
-{
-	kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
-}
-
-static struct kobj_attribute damon_sysfs_ul_range_min_attr =
-		__ATTR_RW_MODE(min, 0600);
-
-static struct kobj_attribute damon_sysfs_ul_range_max_attr =
-		__ATTR_RW_MODE(max, 0600);
-
-static struct attribute *damon_sysfs_ul_range_attrs[] = {
-	&damon_sysfs_ul_range_min_attr.attr,
-	&damon_sysfs_ul_range_max_attr.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
-
-static struct kobj_type damon_sysfs_ul_range_ktype = {
-	.release = damon_sysfs_ul_range_release,
-	.sysfs_ops = &kobj_sysfs_ops,
-	.default_groups = damon_sysfs_ul_range_groups,
-};
-
 /*
  * schemes/stats directory
  */