34 	unsigned long fp, sp, pc;  in walk_stackframe()  local
41 		pc = instruction_pointer(regs);  in walk_stackframe()
45 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
51 		pc = task->thread.ra;  in walk_stackframe()
57 		if (unlikely(!__kernel_text_address(pc) || (level++ >= 0 && !fn(arg, pc))))  in walk_stackframe()
66 		if (regs && (regs->epc == pc) && fp_is_valid(frame->ra, sp)) {  in walk_stackframe()
69 			pc = regs->ra;  in walk_stackframe()
72 			pc = ftrace_graph_ret_addr(current, &graph_idx, frame->ra,  in walk_stackframe()
74 			if (pc == (unsigned long)ret_from_exception) {  in walk_stackframe()
75 				if (unlikely(!__kernel_text_address(pc) || !fn(arg, pc)))  in walk_stackframe()
78 				pc = ((struct pt_regs *)sp)->epc;  in walk_stackframe()
91 	unsigned long sp, pc;  in walk_stackframe()  local
96 		pc = instruction_pointer(regs);  in walk_stackframe()
99 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
103 		pc = task->thread.ra;  in walk_stackframe()
111 		if (__kernel_text_address(pc) && unlikely(!fn(arg, pc)))  in walk_stackframe()
113 		pc = READ_ONCE_NOCHECK(*ksp++) - 0x4;  in walk_stackframe()
119 static bool print_trace_address(void *arg, unsigned long pc)  in print_trace_address()  argument
123 	print_ip_sym(loglvl, pc);  in print_trace_address()
139 static bool save_wchan(void *arg, unsigned long pc)  in save_wchan()  argument
141 	if (!in_sched_functions(pc)) {  in save_wchan()
143 		*p = pc;  in save_wchan()
151 	unsigned long pc = 0;  in __get_wchan()  local
155 	walk_stackframe(task, NULL, save_wchan, &pc);  in __get_wchan()
157 	return pc;  in __get_wchan()