[RFC][PATCH] Makefile: Fix checkstack.pl arm64 wrong or unknown architecture

[George G. Davis]

The following error occurs for the `make ARCH=arm64 checkstack` case:

aarch64-linux-gnu-objdump -d vmlinux $(find . -name '*.ko') | \
perl ./scripts/checkstack.pl arm64
wrong or unknown architecture "arm64"

Fix the above error by setting `CHECKSTACK_ARCH := aarch64` for the
ARCH=arm64 case.

Signed-off-by: George G. Davis <george_davis@xxxxxxxxxx>
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 11358153d8f2..3e615e8553c0 100644
--- a/Makefile
+++ b/Makefile
@@ -1695,7 +1695,11 @@ PHONY += checkstack kernelrelease kernelversion image_name
 ifeq ($(ARCH), um)
 CHECKSTACK_ARCH := $(SUBARCH)
 else
-CHECKSTACK_ARCH := $(ARCH)
+	ifeq ($(ARCH), arm64)
+		CHECKSTACK_ARCH := aarch64
+	else
+		CHECKSTACK_ARCH := $(ARCH)
+	endif
 endif
 checkstack:
 	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
-- 
2.7.4