Makefile: add kselftest-merge

Add kselftest-merge to enable the dependencies of kernel config
for all the kselftest testcases. User should call it after create
the kernel configuration(.config), eg:

$ make kselftest-merge

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index c65fe37c99e5..42e3d1e111bb 100644
--- a/Makefile
+++ b/Makefile
@@ -1087,6 +1087,14 @@ kselftest:
 kselftest-clean:
         $(Q)$(MAKE) -C tools/testing/selftests clean
 
+PHONY += kselftest-merge
+kselftest-merge:
+        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
+        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
+                -m $(objtree)/.config \
+                $(srctree)/tools/testing/selftests/*/config
+        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
+
 # ---------------------------------------------------------------------------
 # Modules
 
@@ -1295,6 +1303,8 @@ help:
         @echo  '                    Build, install, and boot kernel before'
         @echo  '                    running kselftest on it'
         @echo  '  kselftest-clean - Remove all generated kselftest files'
+        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
+        @echo  '                    .config.'
         @echo  ''
         @echo  'Kernel packaging:'
         @$(MAKE) $(build)=$(package-dir) help