1#include <linux/fs.h>
 2#include <linux/init.h>
 3#include <linux/proc_fs.h>
 4#include <linux/sched.h>
 5#include <linux/seq_file.h>
 6#include <linux/time.h>
 7#include <linux/kernel_stat.h>
 8#include <asm/cputime.h>
 9
10static int uptime_proc_show(struct seq_file *m, void *v)
11{
12	struct timespec uptime;
13	struct timespec idle;
 
 
14	int i;
15	cputime_t idletime = cputime_zero;
16
 
17	for_each_possible_cpu(i)
18		idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
19
20	do_posix_clock_monotonic_gettime(&uptime);
21	monotonic_to_bootbased(&uptime);
22	cputime_to_timespec(idletime, &idle);
23	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
24			(unsigned long) uptime.tv_sec,
25			(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
26			(unsigned long) idle.tv_sec,
27			(idle.tv_nsec / (NSEC_PER_SEC / 100)));
28	return 0;
29}
30
31static int uptime_proc_open(struct inode *inode, struct file *file)
32{
33	return single_open(file, uptime_proc_show, NULL);
34}
35
36static const struct file_operations uptime_proc_fops = {
37	.open		= uptime_proc_open,
38	.read		= seq_read,
39	.llseek		= seq_lseek,
40	.release	= single_release,
41};
42
43static int __init proc_uptime_init(void)
44{
45	proc_create("uptime", 0, NULL, &uptime_proc_fops);
46	return 0;
47}
48module_init(proc_uptime_init);

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/fs.h>
 3#include <linux/init.h>
 4#include <linux/proc_fs.h>
 5#include <linux/sched.h>
 6#include <linux/seq_file.h>
 7#include <linux/time.h>
 8#include <linux/kernel_stat.h>
 
 9
10static int uptime_proc_show(struct seq_file *m, void *v)
11{
12	struct timespec uptime;
13	struct timespec idle;
14	u64 nsec;
15	u32 rem;
16	int i;
 
17
18	nsec = 0;
19	for_each_possible_cpu(i)
20		nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
21
22	get_monotonic_boottime(&uptime);
23	idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
24	idle.tv_nsec = rem;
25	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
26			(unsigned long) uptime.tv_sec,
27			(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
28			(unsigned long) idle.tv_sec,
29			(idle.tv_nsec / (NSEC_PER_SEC / 100)));
30	return 0;
31}
32
33static int uptime_proc_open(struct inode *inode, struct file *file)
34{
35	return single_open(file, uptime_proc_show, NULL);
36}
37
38static const struct file_operations uptime_proc_fops = {
39	.open		= uptime_proc_open,
40	.read		= seq_read,
41	.llseek		= seq_lseek,
42	.release	= single_release,
43};
44
45static int __init proc_uptime_init(void)
46{
47	proc_create("uptime", 0, NULL, &uptime_proc_fops);
48	return 0;
49}
50fs_initcall(proc_uptime_init);