823bccfc40
We need to work on cleaning up the relationship between kobjects, ksets and ktypes. The removal of 'struct subsystem' is the first step of this, especially as it is not really needed at all. Thanks to Kay for fixing the bugs in this patch. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
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* are not related to any other subsystem
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This file is release under the GPLv2
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*
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kexec.h>
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#define KERNEL_ATTR_RO(_name) \
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static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
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#define KERNEL_ATTR_RW(_name) \
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static struct subsys_attribute _name##_attr = \
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__ATTR(_name, 0644, _name##_show, _name##_store)
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#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
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/* current uevent sequence number */
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static ssize_t uevent_seqnum_show(struct kset *kset, char *page)
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{
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return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum);
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}
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KERNEL_ATTR_RO(uevent_seqnum);
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/* uevent helper program, used during early boo */
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static ssize_t uevent_helper_show(struct kset *kset, char *page)
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{
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return sprintf(page, "%s\n", uevent_helper);
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}
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static ssize_t uevent_helper_store(struct kset *kset, const char *page, size_t count)
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{
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if (count+1 > UEVENT_HELPER_PATH_LEN)
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return -ENOENT;
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memcpy(uevent_helper, page, count);
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uevent_helper[count] = '\0';
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if (count && uevent_helper[count-1] == '\n')
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uevent_helper[count-1] = '\0';
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return count;
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}
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KERNEL_ATTR_RW(uevent_helper);
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#endif
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#ifdef CONFIG_KEXEC
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static ssize_t kexec_loaded_show(struct kset *kset, char *page)
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{
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return sprintf(page, "%d\n", !!kexec_image);
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}
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KERNEL_ATTR_RO(kexec_loaded);
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static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page)
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{
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return sprintf(page, "%d\n", !!kexec_crash_image);
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}
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KERNEL_ATTR_RO(kexec_crash_loaded);
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#endif /* CONFIG_KEXEC */
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decl_subsys(kernel, NULL, NULL);
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EXPORT_SYMBOL_GPL(kernel_subsys);
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static struct attribute * kernel_attrs[] = {
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#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
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&uevent_seqnum_attr.attr,
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&uevent_helper_attr.attr,
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#endif
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#ifdef CONFIG_KEXEC
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&kexec_loaded_attr.attr,
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&kexec_crash_loaded_attr.attr,
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#endif
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NULL
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};
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static struct attribute_group kernel_attr_group = {
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.attrs = kernel_attrs,
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};
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static int __init ksysfs_init(void)
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{
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int error = subsystem_register(&kernel_subsys);
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if (!error)
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error = sysfs_create_group(&kernel_subsys.kobj,
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&kernel_attr_group);
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return error;
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}
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core_initcall(ksysfs_init);
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