Modify arm64/Kconfig to enable kexec_file_load support.

Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Will Deacon <will.dea...@arm.com>
Acked-by: James Morse <james.mo...@arm.com>
---
 arch/arm64/Kconfig                     |  9 +++++++++
 arch/arm64/kernel/Makefile             |  3 ++-
 arch/arm64/kernel/machine_kexec_file.c | 16 ++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/kernel/machine_kexec_file.c

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 42c090cf0292..a9a3a5583c8b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -835,6 +835,15 @@ config KEXEC
          but it is independent of the system firmware.   And like a reboot
          you can start any kernel with it, not just Linux.
 
+config KEXEC_FILE
+       bool "kexec file based system call"
+       select KEXEC_CORE
+       help
+         This is new version of kexec system call. This system call is
+         file based and takes file descriptors as system call argument
+         for kernel and initramfs as opposed to list of segments as
+         accepted by previous system call.
+
 config CRASH_DUMP
        bool "Build kdump crash kernel"
        help
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 0025f8691046..06281e1ad7ed 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -48,8 +48,9 @@ arm64-obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL)       += 
acpi_parking_protocol.o
 arm64-obj-$(CONFIG_PARAVIRT)           += paravirt.o
 arm64-obj-$(CONFIG_RANDOMIZE_BASE)     += kaslr.o
 arm64-obj-$(CONFIG_HIBERNATION)                += hibernate.o hibernate-asm.o
-arm64-obj-$(CONFIG_KEXEC)              += machine_kexec.o relocate_kernel.o    
\
+arm64-obj-$(CONFIG_KEXEC_CORE)         += machine_kexec.o relocate_kernel.o    
\
                                           cpu-reset.o
+arm64-obj-$(CONFIG_KEXEC_FILE)         += machine_kexec_file.o
 arm64-obj-$(CONFIG_ARM64_RELOC_TEST)   += arm64-reloc-test.o
 arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
 arm64-obj-$(CONFIG_CRASH_DUMP)         += crash_dump.o
diff --git a/arch/arm64/kernel/machine_kexec_file.c 
b/arch/arm64/kernel/machine_kexec_file.c
new file mode 100644
index 000000000000..c38a8048ed00
--- /dev/null
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * kexec_file for arm64
+ *
+ * Copyright (C) 2018 Linaro Limited
+ * Author: AKASHI Takahiro <takahiro.aka...@linaro.org>
+ *
+ */
+
+#define pr_fmt(fmt) "kexec_file: " fmt
+
+#include <linux/kexec.h>
+
+const struct kexec_file_ops * const kexec_file_loaders[] = {
+       NULL
+};
-- 
2.17.0


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