Simply use the first argument to specify the subset of selftests.
Use comma notation to separate multiple tests.
(e.g. ./run_kselftest.sh size,timers,...)
Default behaviour is running all selftests.

Each selftest be defined as function that we can run one of selftests.
The function name has underline as prefix to avoid confilct with
built-in command of shell.
(e.g. The exec is built-in command of shell)
The hyhpen of function name be replace to the underline because
not all shells can use hyphen in function name, like sh, ash and so on.

Signed-off-by: Zong Li <z...@andestech.com>
Cc: Greentime Hu <greent...@andestech.com>
Cc: Shuah Khan <sh...@kernel.org>
---
 tools/testing/selftests/Makefile | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..08e2a855f187 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -128,13 +128,22 @@ ifdef INSTALL_PATH
 
        for TARGET in $(TARGETS); do \
                BUILD_TARGET=$$BUILD/$$TARGET;  \
+               echo "_$${TARGET//-/_}()" >> $(ALL_SCRIPT); \
+               echo "{" >> $(ALL_SCRIPT); \
                echo "echo ; echo Running tests in $$TARGET" >> $(ALL_SCRIPT); \
                echo "echo ========================================" >> 
$(ALL_SCRIPT); \
                echo "cd $$TARGET" >> $(ALL_SCRIPT); \
                make -s --no-print-directory OUTPUT=$$BUILD_TARGET -C $$TARGET 
emit_tests >> $(ALL_SCRIPT); \
                echo "cd \$$ROOT" >> $(ALL_SCRIPT); \
+               echo "}" >> $(ALL_SCRIPT); \
+               echo "" >> $(ALL_SCRIPT); \
        done;
 
+       echo "TARGETS=\$${1:-\`ls -d */ | sed 's#/##' \`}" >> $(ALL_SCRIPT);
+       echo "for TARGET in \$${TARGETS//,/ }; do" >> $(ALL_SCRIPT);
+       echo "    _\$${TARGET//-/_}" >> $(ALL_SCRIPT);
+       echo "done" >> $(ALL_SCRIPT);
+
        chmod u+x $(ALL_SCRIPT)
 else
        $(error Error: set INSTALL_PATH to use install)
-- 
2.16.1

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