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kernel: ksysfs: initialize kernel_kobj earlier

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Software nodes depend on kernel_kobj which is initialized pretty late
into the boot process - as a core_initcall(). Ahead of moving the
software node initialization to driver_init() we must first make
kernel_kobj available before it.

Make ksysfs_init() visible in a new header - ksysfs.h - and call it in
do_basic_setup() right before driver_init().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260402-nokia770-gpio-swnodes-v5-1-d730db3dd299@oss.qualcomm.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Bartosz Golaszewski
2026-04-02 16:15:02 +02:00
committed by Danilo Krummrich
parent 704b2a7d75
commit 9617b5b62c
4 changed files with 15 additions and 5 deletions
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1
MAINTAINERS
View File

@@ -7805,6 +7805,7 @@ F: include/linux/debugfs.h
F: include/linux/device.h
F: include/linux/fwnode.h
F: include/linux/kobj*
F: include/linux/ksysfs.h
F: include/linux/property.h
F: include/linux/sysfs.h
F: kernel/ksysfs.c

8
include/linux/ksysfs.h Normal file
View File

@@ -0,0 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _KSYSFS_H_
#define _KSYSFS_H_
void ksysfs_init(void);
#endif /* _KSYSFS_H_ */

2
init/main.c
View File

@@ -36,6 +36,7 @@
#include <linux/kmod.h>
#include <linux/kprobes.h>
#include <linux/kmsan.h>
#include <linux/ksysfs.h>
#include <linux/vmalloc.h>
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
@@ -1473,6 +1474,7 @@ static void __init do_initcalls(void)
static void __init do_basic_setup(void)
{
cpuset_init_smp();
ksysfs_init();
driver_init();
init_irq_proc();
do_ctors();

9
kernel/ksysfs.c
View File

@@ -8,6 +8,7 @@
#include <asm/byteorder.h>
#include <linux/kobject.h>
#include <linux/ksysfs.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/export.h>
@@ -213,7 +214,7 @@ static const struct attribute_group kernel_attr_group = {
.attrs = kernel_attrs,
};
static int __init ksysfs_init(void)
void __init ksysfs_init(void)
{
int error;
@@ -234,14 +235,12 @@ static int __init ksysfs_init(void)
goto group_exit;
}
return 0;
return;
group_exit:
sysfs_remove_group(kernel_kobj, &kernel_attr_group);
kset_exit:
kobject_put(kernel_kobj);
exit:
return error;
pr_err("failed to initialize the kernel kobject: %d\n", error);
}
core_initcall(ksysfs_init);