[PATCH RFC 05/17] arm64: text replication: add init function

[Russell King (Oracle)]

A simple patch that adds an empty function for kernel text replication
initialisation and hooks it into the initialisation path.

Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
---
 arch/arm64/include/asm/ktext.h | 20 ++++++++++++++++++++
 arch/arm64/mm/Makefile         |  2 ++
 arch/arm64/mm/init.c           |  3 +++
 arch/arm64/mm/ktext.c          |  8 ++++++++
 4 files changed, 33 insertions(+)
 create mode 100644 arch/arm64/include/asm/ktext.h
 create mode 100644 arch/arm64/mm/ktext.c

diff --git a/arch/arm64/include/asm/ktext.h b/arch/arm64/include/asm/ktext.h
new file mode 100644
index 000000000000..1a5f7452a3bf
--- /dev/null
+++ b/arch/arm64/include/asm/ktext.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2022, Oracle and/or its affiliates.
+ */
+#ifndef ASM_KTEXT_H
+#define ASM_KTEXT_H
+
+#ifdef CONFIG_REPLICATE_KTEXT
+
+void ktext_replication_init(void);
+
+#else
+
+static inline void ktext_replication_init(void)
+{
+}
+
+#endif
+
+#endif
diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
index dbd1bc95967d..41e705027c57 100644
--- a/arch/arm64/mm/Makefile
+++ b/arch/arm64/mm/Makefile
@@ -14,3 +14,5 @@ KASAN_SANITIZE_physaddr.o	+= n
 
 obj-$(CONFIG_KASAN)		+= kasan_init.o
 KASAN_SANITIZE_kasan_init.o	:= n
+
+obj-$(CONFIG_REPLICATE_KTEXT)	+= ktext.o
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 66e70ca47680..a0e4f2d93ee6 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -36,6 +36,7 @@
 #include <asm/fixmap.h>
 #include <asm/kasan.h>
 #include <asm/kernel-pgtable.h>
+#include <asm/ktext.h>
 #include <asm/kvm_host.h>
 #include <asm/memory.h>
 #include <asm/numa.h>
@@ -401,6 +402,8 @@ void __init bootmem_init(void)
 
 	arch_numa_init();
 
+	ktext_replication_init();
+
 	/*
 	 * must be done after arch_numa_init() which calls numa_init() to
 	 * initialize node_online_map that gets used in hugetlb_cma_reserve()
diff --git a/arch/arm64/mm/ktext.c b/arch/arm64/mm/ktext.c
new file mode 100644
index 000000000000..3a8d37c9abc4
--- /dev/null
+++ b/arch/arm64/mm/ktext.c
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022, Oracle and/or its affiliates.
+ */
+
+void __init ktext_replication_init(void)
+{
+}
-- 
2.30.2