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kernel add
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#ifndef __CPUPOWER_HELPERS_SYSFS_H__
#define __CPUPOWER_HELPERS_SYSFS_H__
#define PATH_TO_CPU "/sys/devices/system/cpu/"
#define MAX_LINE_LEN 255
#define SYSFS_PATH_MAX 255
extern unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen);
extern unsigned int sysfs_idlestate_file_exists(unsigned int cpu,
unsigned int idlestate,
const char *fname);
extern int sysfs_is_cpu_online(unsigned int cpu);
extern int sysfs_is_idlestate_disabled(unsigned int cpu,
unsigned int idlestate);
extern int sysfs_idlestate_disable(unsigned int cpu, unsigned int idlestate,
unsigned int disable);
extern unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
unsigned int idlestate);
extern unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
unsigned int idlestate);
extern unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
unsigned int idlestate);
extern char *sysfs_get_idlestate_name(unsigned int cpu,
unsigned int idlestate);
extern char *sysfs_get_idlestate_desc(unsigned int cpu,
unsigned int idlestate);
extern unsigned int sysfs_get_idlestate_count(unsigned int cpu);
extern char *sysfs_get_cpuidle_governor(void);
extern char *sysfs_get_cpuidle_driver(void);
extern int sysfs_get_sched(const char *smt_mc);
extern int sysfs_set_sched(const char *smt_mc, int val);
#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */
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