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1// SPDX-License-Identifier: GPL-2.02#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/time_namespace.h>9#include <linux/kernel_stat.h>10#include "internal.h"11 12static int uptime_proc_show(struct seq_file *m, void *v)13{14 struct timespec64 uptime;15 struct timespec64 idle;16 u64 idle_nsec;17 u32 rem;18 int i;19 20 idle_nsec = 0;21 for_each_possible_cpu(i) {22 struct kernel_cpustat kcs;23 24 kcpustat_cpu_fetch(&kcs, i);25 idle_nsec += get_idle_time(&kcs, i);26 }27 28 ktime_get_boottime_ts64(&uptime);29 timens_add_boottime(&uptime);30 31 idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem);32 idle.tv_nsec = rem;33 seq_printf(m, "%lu.%02lu %lu.%02lu\n",34 (unsigned long) uptime.tv_sec,35 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),36 (unsigned long) idle.tv_sec,37 (idle.tv_nsec / (NSEC_PER_SEC / 100)));38 return 0;39}40 41static int __init proc_uptime_init(void)42{43 struct proc_dir_entry *pde;44 45 pde = proc_create_single("uptime", 0, NULL, uptime_proc_show);46 pde_make_permanent(pde);47 return 0;48}49fs_initcall(proc_uptime_init);50