[PATCH] kbuild: Add vmlinux_install to facilitate debugging

[Zach Wade <zachwade.k@gmail.com>]

When testing multiple versions of the kernel with the same source code,it 
is often necessary to recompile the kernel, which is time-consuming for 
small hosts. I need to cp vmlinux to the corresponding module directory.
I think adding this will make debugging the kernel a little more 
convenient.

Signed-off-by: Zach Wade <zachwade.k@gmail.com>
---
 Makefile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Makefile b/Makefile
index c5493c0c0ca1..1caab011599f 100644
--- a/Makefile
+++ b/Makefile
@@ -1579,6 +1579,7 @@ help:
 	@echo  '* vmlinux	  - Build the bare kernel'
 	@echo  '* modules	  - Build all modules'
 	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
+	@echo  '  vmlinux_install - Install vmlinux to INSTALL_MOD_PATH (default: /)'
 	@echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
 	@echo  '  dir/            - Build all files in dir and below'
 	@echo  '  dir/file.[ois]  - Build specified target only'
@@ -1887,6 +1888,19 @@ modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
 	 $(if $(KBUILD_MODULES), modules_check)
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
+# ---------------------------------------------------------------------------
+# vmlinux install
+
+PHONY += vmlinux_install
+
+vmlinux_install:
+	@if [ -f vmlinux ]; then \
+		echo "INSTALL ${MODLIB}/vmlinux"; \
+		cp -f vmlinux ${MODLIB}/ ; \
+	else \
+		echo "vmlinux file does not exist."; \
+	fi
+
 # Single targets
 # ---------------------------------------------------------------------------
 # To build individual files in subdirectories, you can do like this:
-- 
2.46.0