1// SPDX-License-Identifier: GPL-2.0 2#include <linux/cpufreq.h> 3#include <linux/fs.h> 4#include <linux/init.h> 5#include <linux/proc_fs.h> 6#include <linux/seq_file.h> 7 8__weak void arch_freq_prepare_all(void) 9{ 10} 11 12extern const struct seq_operations cpuinfo_op; 13static int cpuinfo_open(struct inode *inode, struct file *file) 14{ 15 arch_freq_prepare_all(); 16 return seq_open(file, &cpuinfo_op); 17} 18 19static const struct proc_ops cpuinfo_proc_ops = { 20 .proc_flags = PROC_ENTRY_PERMANENT, 21 .proc_open = cpuinfo_open, 22 .proc_read_iter = seq_read_iter, 23 .proc_lseek = seq_lseek, 24 .proc_release = seq_release, 25}; 26 27static int __init proc_cpuinfo_init(void) 28{ 29 proc_create("cpuinfo", 0, NULL, &cpuinfo_proc_ops); 30 return 0; 31} 32fs_initcall(proc_cpuinfo_init); 33