| #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 */ |