24 	unsigned long fp, sp, pc;  in walk_stackframe()  local
30 		pc = instruction_pointer(regs);  in walk_stackframe()
34 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
40 		pc = task->thread.ra;  in walk_stackframe()
47 		if (unlikely(!__kernel_text_address(pc) || (level++ >= 0 && !fn(arg, pc))))  in walk_stackframe()
58 		if (regs && (regs->epc == pc) && (frame->fp & 0x7)) {  in walk_stackframe()
60 			pc = regs->ra;  in walk_stackframe()
63 			pc = ftrace_graph_ret_addr(current, NULL, frame->ra,  in walk_stackframe()
65 			if (pc == (unsigned long)ret_from_exception) {  in walk_stackframe()
66 				if (unlikely(!__kernel_text_address(pc) || !fn(arg, pc)))  in walk_stackframe()
69 				pc = ((struct pt_regs *)sp)->epc;  in walk_stackframe()
82 	unsigned long sp, pc;  in walk_stackframe()  local
87 		pc = instruction_pointer(regs);  in walk_stackframe()
90 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
94 		pc = task->thread.ra;  in walk_stackframe()
102 		if (__kernel_text_address(pc) && unlikely(!fn(arg, pc)))  in walk_stackframe()
104 		pc = READ_ONCE_NOCHECK(*ksp++) - 0x4;  in walk_stackframe()
110 static bool print_trace_address(void *arg, unsigned long pc)  in print_trace_address()  argument
114 	print_ip_sym(loglvl, pc);  in print_trace_address()
130 static bool save_wchan(void *arg, unsigned long pc)  in save_wchan()  argument
132 	if (!in_sched_functions(pc)) {  in save_wchan()
134 		*p = pc;  in save_wchan()
142 	unsigned long pc = 0;  in __get_wchan()  local
146 	walk_stackframe(task, NULL, save_wchan, &pc);  in __get_wchan()
148 	return pc;  in __get_wchan()