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e56397e8c4
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.") the
driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Link: https://lkml.kernel.org/r/20230207-kobj_type-damon-v1-1-9d4fea6a465b@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Common Primitives for DAMON Sysfs Interface
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*
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* Author: SeongJae Park <sj@kernel.org>
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*/
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#include <linux/slab.h>
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#include "sysfs-common.h"
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DEFINE_MUTEX(damon_sysfs_lock);
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/*
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* unsigned long range directory
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*/
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struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
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unsigned long min,
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unsigned long max)
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{
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struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range),
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GFP_KERNEL);
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if (!range)
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return NULL;
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range->kobj = (struct kobject){};
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range->min = min;
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range->max = max;
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return range;
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}
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static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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struct damon_sysfs_ul_range *range = container_of(kobj,
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struct damon_sysfs_ul_range, kobj);
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return sysfs_emit(buf, "%lu\n", range->min);
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}
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static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct damon_sysfs_ul_range *range = container_of(kobj,
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struct damon_sysfs_ul_range, kobj);
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unsigned long min;
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int err;
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err = kstrtoul(buf, 0, &min);
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if (err)
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return err;
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range->min = min;
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return count;
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}
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static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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struct damon_sysfs_ul_range *range = container_of(kobj,
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struct damon_sysfs_ul_range, kobj);
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return sysfs_emit(buf, "%lu\n", range->max);
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}
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static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct damon_sysfs_ul_range *range = container_of(kobj,
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struct damon_sysfs_ul_range, kobj);
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unsigned long max;
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int err;
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err = kstrtoul(buf, 0, &max);
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if (err)
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return err;
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range->max = max;
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return count;
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}
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void damon_sysfs_ul_range_release(struct kobject *kobj)
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{
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kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
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}
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static struct kobj_attribute damon_sysfs_ul_range_min_attr =
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__ATTR_RW_MODE(min, 0600);
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static struct kobj_attribute damon_sysfs_ul_range_max_attr =
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__ATTR_RW_MODE(max, 0600);
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static struct attribute *damon_sysfs_ul_range_attrs[] = {
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&damon_sysfs_ul_range_min_attr.attr,
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&damon_sysfs_ul_range_max_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
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const struct kobj_type damon_sysfs_ul_range_ktype = {
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.release = damon_sysfs_ul_range_release,
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.sysfs_ops = &kobj_sysfs_ops,
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.default_groups = damon_sysfs_ul_range_groups,
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};
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