[LTP] [PATCH v2] tst_test.sh: achieve TST_RETRY_FUNC function in shell

[Li Wang]

Hi Petr,

​And also, we'd better skip the TST_ prefix name check in test library,
otherwise we will get LTP warnings like:

<<<test_output>>>
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TWARN: Reserved variable TST_RETRY_FUNC used!
numa01 1 TINFO: The system contains 2 nodes:  0 1
numa01 1 TPASS: NUMA local node and memory affinity
numa01 2 TPASS: NUMA preferred node policy
numa01 3 TPASS: NUMA share memory allocated in preferred node
numa01 4 TPASS: NUMA interleave policy
numa01 5 TPASS: NUMA interleave policy on shared memory
numa01 6 TPASS: NUMA phycpubind policy
numa01 7 TPASS: NUMA local node allocation
numa01 8 TPASS: NUMA MEMHOG policy

----------------
 tst_umount()
 {
        local device="$1"
@@ -255,6 +297,7 @@ tst_run()
                        OPTS|USAGE|PARSE_ARGS|POS_ARGS);;
                        NEEDS_ROOT|NEEDS_TMPDIR|NEEDS_DEVICE|DEVICE);;
                        NEEDS_CMDS|NEEDS_MODULE|MODPATH|DATAROOT);;
+                       RETRY_FUNC|RETRY_FN_EXP_BACKOFF);;
                        IPV6);;
                        *) tst_res TWARN "Reserved variable TST_$tst_i
used!";;
                        esac
​

​I prefer to merge this change along with your suggestions in PATCH v3 as
well.

Thanks,
Li Wang​
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