513  * next frame tail.
516 unwind_user_frame(struct frame_tail __user *tail, void *cookie,  in unwind_user_frame()  argument
524 	if (!access_ok(tail, sizeof(buftail)))  in unwind_user_frame()
528 	err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));  in unwind_user_frame()
543 	if (tail >= buftail.fp)  in unwind_user_frame()
565 unwind_compat_user_frame(struct compat_frame_tail __user *tail, void *cookie,  in unwind_compat_user_frame()  argument
572 	if (!access_ok(tail, sizeof(buftail)))  in unwind_compat_user_frame()
576 	err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));  in unwind_compat_user_frame()
589 	if (tail + 1 >= (struct compat_frame_tail __user *)  in unwind_compat_user_frame()
606 		struct frame_tail __user *tail;  in arch_stack_walk_user()  local
608 		tail = (struct frame_tail __user *)regs->regs[29];  in arch_stack_walk_user()
609 		while (tail && !((unsigned long)tail & 0x7))  in arch_stack_walk_user()
610 			tail = unwind_user_frame(tail, cookie, consume_entry);  in arch_stack_walk_user()
614 		struct compat_frame_tail __user *tail;  in arch_stack_walk_user()  local
616 		tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;  in arch_stack_walk_user()
617 		while (tail && !((unsigned long)tail & 0x3))  in arch_stack_walk_user()
618 			tail = unwind_compat_user_frame(tail, cookie, consume_entry);  in arch_stack_walk_user()