51 	unsigned long fp, sp, pc;  in walk_stackframe()  local
58 		pc = instruction_pointer(regs);  in walk_stackframe()
62 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
68 		pc = task->thread.ra;  in walk_stackframe()
74 		if (unlikely(!__kernel_text_address(pc) || (level++ >= 0 && !fn(arg, pc))))  in walk_stackframe()
83 		if (regs && (regs->epc == pc) && fp_is_valid(frame->ra, sp)) {  in walk_stackframe()
86 			pc = regs->ra;  in walk_stackframe()
89 			pc = READ_ONCE_TASK_STACK(task, frame->ra);  in walk_stackframe()
90 			pc = ftrace_graph_ret_addr(current, &graph_idx, pc,  in walk_stackframe()
92 			if (pc >= (unsigned long)handle_exception &&  in walk_stackframe()
93 			    pc < (unsigned long)&ret_from_exception_end) {  in walk_stackframe()
94 				if (unlikely(!fn(arg, pc)))  in walk_stackframe()
97 				pc = ((struct pt_regs *)sp)->epc;  in walk_stackframe()
110 	unsigned long sp, pc;  in walk_stackframe()  local
115 		pc = instruction_pointer(regs);  in walk_stackframe()
118 		pc = (unsigned long)walk_stackframe;  in walk_stackframe()
122 		pc = task->thread.ra;  in walk_stackframe()
130 		if (__kernel_text_address(pc) && unlikely(!fn(arg, pc)))  in walk_stackframe()
132 		pc = READ_ONCE_NOCHECK(*ksp++) - 0x4;  in walk_stackframe()
138 static bool print_trace_address(void *arg, unsigned long pc)  in print_trace_address()  argument
142 	print_ip_sym(loglvl, pc);  in print_trace_address()
158 static bool save_wchan(void *arg, unsigned long pc)  in save_wchan()  argument
160 	if (!in_sched_functions(pc)) {  in save_wchan()
162 		*p = pc;  in save_wchan()
170 	unsigned long pc = 0;  in __get_wchan()  local
174 	walk_stackframe(task, NULL, save_wchan, &pc);  in __get_wchan()
176 	return pc;  in __get_wchan()