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#ifndef _LINUX_TRACE_BOOT_H
#define _LINUX_TRACE_BOOT_H
/*
* Structure which defines the trace of an initcall.
* You don't have to fill the func field since it is
* only used internally by the tracer.
*/
struct boot_trace {
pid_t caller;
char func[KSYM_NAME_LEN];
int result;
unsigned long long duration; /* usecs */
ktime_t calltime;
ktime_t rettime;
};
#ifdef CONFIG_BOOT_TRACER
/* Append the trace on the ring-buffer */
extern void trace_boot(struct boot_trace *it, initcall_t fn);
/* Tells the tracer that smp_pre_initcall is finished.
* So we can start the tracing
*/
extern void start_boot_trace(void);
/* Resume the tracing of other necessary events
* such as sched switches
*/
extern void enable_boot_trace(void);
/* Suspend this tracing. Actually, only sched_switches tracing have
* to be suspended. Initcalls doesn't need it.)
*/
extern void disable_boot_trace(void);
#else
static inline void trace_boot(struct boot_trace *it, initcall_t fn) { }
static inline void start_boot_trace(void) { }
static inline void enable_boot_trace(void) { }
static inline void disable_boot_trace(void) { }
#endif /* CONFIG_BOOT_TRACER */
#endif /* __LINUX_TRACE_BOOT_H */
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