v4.19.13 snapshot.
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
new file mode 100644
index 0000000..8004336
--- /dev/null
+++ b/arch/powerpc/kernel/signal.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Corporation
+ * Extracted from signal_32.c and signal_64.c
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file README.legal in the main directory of
+ * this archive for more details.
+ */
+
+#ifndef _POWERPC_ARCH_SIGNAL_H
+#define _POWERPC_ARCH_SIGNAL_H
+
+extern void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags);
+
+extern void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
+ size_t frame_size, int is_32);
+
+extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
+ struct task_struct *tsk);
+
+extern int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
+ struct task_struct *tsk);
+
+extern unsigned long copy_fpr_to_user(void __user *to,
+ struct task_struct *task);
+extern unsigned long copy_ckfpr_to_user(void __user *to,
+ struct task_struct *task);
+extern unsigned long copy_fpr_from_user(struct task_struct *task,
+ void __user *from);
+extern unsigned long copy_ckfpr_from_user(struct task_struct *task,
+ void __user *from);
+extern unsigned long get_tm_stackpointer(struct task_struct *tsk);
+
+#ifdef CONFIG_VSX
+extern unsigned long copy_vsx_to_user(void __user *to,
+ struct task_struct *task);
+extern unsigned long copy_ckvsx_to_user(void __user *to,
+ struct task_struct *task);
+extern unsigned long copy_vsx_from_user(struct task_struct *task,
+ void __user *from);
+extern unsigned long copy_ckvsx_from_user(struct task_struct *task,
+ void __user *from);
+#endif
+
+#ifdef CONFIG_PPC64
+
+extern int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
+ struct task_struct *tsk);
+
+#else /* CONFIG_PPC64 */
+
+extern long sys_rt_sigreturn(void);
+extern long sys_sigreturn(void);
+
+static inline int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
+ struct task_struct *tsk)
+{
+ return -EFAULT;
+}
+
+#endif /* !defined(CONFIG_PPC64) */
+
+#endif /* _POWERPC_ARCH_SIGNAL_H */