[PATCH] kselftest: add cleankselftest rule

[Wang Long]

We use

    $make TARGETS="size timers" kselftest

to build and run selftests. but there is no rule
for us to clean the kselftest generated files.

This patch add the rules, for example:

	$ make TARGETS="size timers" cleankselftest

can clean all kselftst generated files.

Signed-off-by: Wang Long <long.wanglong@xxxxxxxxxx>
---
 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index 84f4b31..c25d139 100644
--- a/Makefile
+++ b/Makefile
@@ -1075,6 +1075,9 @@ PHONY += kselftest
 kselftest:
 	$(Q)$(MAKE) -C tools/testing/selftests run_tests
 
+cleankselftest:
+	$(Q)$(MAKE) -C tools/testing/selftests clean
+
 # ---------------------------------------------------------------------------
 # Modules
 
@@ -1282,6 +1285,7 @@ help:
 	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
 	@echo  '                    Build, install, and boot kernel before'
 	@echo  '                    running kselftest on it'
+	@echo  '  cleankselftest  - Remove all generated kselftest files'
 	@echo  ''
 	@echo  'Kernel packaging:'
 	@$(MAKE) $(build)=$(package-dir) help
-- 
1.8.3.4

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