// SPDX-License-Identifier: GPL-2.0 #include <linux/fs.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/sched.h> #include <linux/seq_file.h> #include <linux/time.h> #include <linux/kernel_stat.h> static int uptime_proc_show(struct seq_file *m, void *v) { struct timespec64 uptime; struct timespec64 idle; u64 nsec; u32 rem; int i; nsec = 0; for_each_possible_cpu(i) nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE]; ktime_get_boottime_ts64(&uptime); idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); idle.tv_nsec = rem; seq_printf(m, "%lu.%02lu %lu.%02lu\n", (unsigned long) uptime.tv_sec, (uptime.tv_nsec / (NSEC_PER_SEC / 100)), (unsigned long) idle.tv_sec, (idle.tv_nsec / (NSEC_PER_SEC / 100))); return 0; } static int __init proc_uptime_init(void) { proc_create_single("uptime", 0, NULL, uptime_proc_show); return 0; } fs_initcall(proc_uptime_init);