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 12 extern const struct seq_operations cpuinfo_op; 13 static int cpuinfo_open(struct inode *inode, struct file *file) 14 { 15 arch_freq_prepare_all(); 16 return seq_open(file, &cpuinfo_op); 17 } 18 19 static const struct proc_ops cpuinfo_proc_ops = { 20 .proc_flags = PROC_ENTRY_PERMANENT, 21 .proc_open = cpuinfo_open, 22 .proc_read = seq_read, 23 .proc_lseek = seq_lseek, 24 .proc_release = seq_release, 25 }; 26 27 static int __init proc_cpuinfo_init(void) 28 { 29 proc_create("cpuinfo", 0, NULL, &cpuinfo_proc_ops); 30 return 0; 31 } 32 fs_initcall(proc_cpuinfo_init); 33