[PATCH 4/6] kbuild: add a new kselftest_install make target to install selftests

[Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>]

Add a new make target to install kernel selftests. This new target will
build and install selftests.

The default is just $(objtree)/selftests. This is preferable to
something based on $(INSTALL_MOD_PATH) (which defaults to /), as it
allows a normal user to install the tests. This is similar to the
default behaviour of make headers_install.

Therefore the most basic usage is:

$ make kselftests_install
$ ./selftests/all.sh

To install elsewhere use:

$ make kselftests_install INSTALL_SELFTESTS_PATH=/some/where
$ /some/where/all.sh

Signed-off-by: Shuah Khan <shuahkh-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
Signed-off-by: Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>
---
 Makefile                         | 13 ++++++++++++-
 tools/testing/selftests/Makefile |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index eb4eca56843a..c186a928d8be 100644
--- a/Makefile
+++ b/Makefile
@@ -1072,12 +1072,20 @@ headers_check: headers_install
 	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 
 # ---------------------------------------------------------------------------
-# Kernel selftest
+# Kernel selftest targets
+
+# Default base path for kselftest install
+INSTALL_SELFTESTS_PATH = $(abspath $(objtree)/selftests)
 
 PHONY += kselftest
 kselftest:
 	$(Q)$(MAKE) -C tools/testing/selftests run_tests
 
+# Kernel selftest install
+PHONY += kselftest_install
+kselftest_install:
+	$(Q)$(MAKE) -C tools/testing/selftests INSTALL_PATH=$(INSTALL_SELFTESTS_PATH) install
+
 # ---------------------------------------------------------------------------
 # Modules
 
@@ -1286,6 +1294,9 @@ help:
 	@echo  '                    Build, install, and boot kernel before'
 	@echo  '                    running kselftest on it'
 	@echo  ''
+	@echo  '  kselftest_install - Install selftests to INSTALL_SELFTESTS_PATH'
+	@echo  '                      default: $(INSTALL_SELFTESTS_PATH)'
+	@echo  ''
 	@echo  'Kernel packaging:'
 	@$(MAKE) $(build)=$(package-dir) help
 	@echo  ''
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 4f2849b5ff77..a2345f4512bb 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -62,6 +62,7 @@ ifdef INSTALL_PATH
 
 	@# Ask all targets to emit their test scripts
 	echo "#!/bin/bash\n\n" > $(ALL_SCRIPT)
+	echo "cd \$$(dirname \$$0)" >> $(ALL_SCRIPT)
 	echo "ROOT=\$$PWD\n" >> $(ALL_SCRIPT)
 
 	for TARGET in $(TARGETS); do \
-- 
2.1.0