dbgfs_file_io 24 drivers/cpufreq/s3c24xx-cpufreq-debugfs.c static struct dentry *dbgfs_file_io; dbgfs_file_io 150 drivers/cpufreq/s3c24xx-cpufreq-debugfs.c dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,