From: "Pratyush Yadav (Google)" <pratyush@kernel.org>

In a coming commit, memblock will start using kho_scratch_overlap()
without a compile guard. The compile guard for the function is in
kexec_handover.h and provides a stub when CONFIG_KEXEC_HANDOVER is
disabled.

Since in memblock the call will exist unconditionally, always include
the KHO headers.

Including these headers unconditionally breaks memblock test
compilation. Add stubs to fix that.

Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>
---
 mm/memblock.c                                   |  2 --
 tools/testing/memblock/linux/kexec_handover.h   |  9 +++++++++
 tools/testing/memblock/linux/kho/abi/memblock.h | 10 ++++++++++
 tools/testing/memblock/linux/libfdt.h           |  9 +++++++++
 4 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/memblock/linux/kexec_handover.h
 create mode 100644 tools/testing/memblock/linux/kho/abi/memblock.h
 create mode 100644 tools/testing/memblock/linux/libfdt.h

diff --git a/mm/memblock.c b/mm/memblock.c
index 8b2e551435ae..ea735bcd4dd1 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -19,11 +19,9 @@
 #include <linux/mutex.h>
 #include <linux/string_helpers.h>
 
-#ifdef CONFIG_KEXEC_HANDOVER
 #include <linux/libfdt.h>
 #include <linux/kexec_handover.h>
 #include <linux/kho/abi/memblock.h>
-#endif /* CONFIG_KEXEC_HANDOVER */
 
 #include <asm/sections.h>
 #include <linux/io.h>
diff --git a/tools/testing/memblock/linux/kexec_handover.h b/tools/testing/memblock/linux/kexec_handover.h
new file mode 100644
index 000000000000..bdfd9445b1fd
--- /dev/null
+++ b/tools/testing/memblock/linux/kexec_handover.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_KEXEC_HANDOVER_H
+#define LINUX_KEXEC_HANDOVER_H
+
+/*
+ * Header stub to avoid test build breakage; we don't need to actually implement
+ * any KHO functions as they are not used in the tests.
+ */
+#endif /* LINUX_KEXEC_HANDOVER_H */
diff --git a/tools/testing/memblock/linux/kho/abi/memblock.h b/tools/testing/memblock/linux/kho/abi/memblock.h
new file mode 100644
index 000000000000..71cf6982a2b9
--- /dev/null
+++ b/tools/testing/memblock/linux/kho/abi/memblock.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _LINUX_KHO_ABI_MEMBLOCK_H
+#define _LINUX_KHO_ABI_MEMBLOCK_H
+
+/*
+ * Header stub to avoid test build breakage; we don't need to actually define
+ * any ABI as they are not used in the tests.
+ */
+#endif /* _LINUX_KHO_ABI_MEMBLOCK_H */
diff --git a/tools/testing/memblock/linux/libfdt.h b/tools/testing/memblock/linux/libfdt.h
new file mode 100644
index 000000000000..6137b788fe8d
--- /dev/null
+++ b/tools/testing/memblock/linux/libfdt.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _INCLUDE_LIBFDT_H_
+#define _INCLUDE_LIBFDT_H_
+
+/*
+ * Header stub to avoid test build breakage; we don't need to actually implement
+ * any FDT functions as they are not used in the tests.
+ */
+#endif /* _INCLUDE_LIBFDT_H_ */
-- 
2.55.0.571.g244d577d93-goog