irq:irqbalance01 in ubuntu_ltp failed with " TBROK: No IRQs found in /proc/interrupts?" on s390x

[Po-Hsu Lin]

Issue spotted on Bionic 4.15.0-166.174 s390x instances kernel02 and s2lp3

This is a new test added recently (bug 1955398), not a regression.

Like bug 1955452 but the error message is a bit different.
Test marked as broken with:
    TBROK: No IRQs found in /proc/interrupts?

Test log:
Checking for required user/group ids

'nobody' user id and group found.
'bin' user id and group found.
'daemon' user id and group found.
Users group found.
Sys group found.
Required users/groups exist.
no big block device was specified on commandline.
Tests which require a big block device are disabled.
You can specify it with option -z
INFO: Test start time: Mon 20 Dec 11:38:32 GMT 2021
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 31162 -n 31162 -f /tmp/ltp-jhK2Rc1qw2/alltests -l /dev/null -C /dev/null -T /dev/null
LOG File: /dev/null
FAILED COMMAND File: /dev/null
TCONF COMMAND File: /dev/null
Running tests.......
tst_test.c:1425: TINFO: Timeout per run is 0h 05m 00s
irqbalance01.c:129: TINFO: Found 8 CPUS, 0 IRQs
  IRQ CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
Total: 0 0 0 0 0 0 0 0
irqbalance01.c:301: TBROK: No IRQs found in /proc/interrupts?

Summary:
passed 0
failed 0
broken 1
skipped 0
warnings 0

[Francis Ginther (fginther)]

This test is incompatible with s390x. The test assumes all IRQs are identified with numeric ID like in this table (the left most column):
$ cat /proc/interrupts
            CPU0 CPU1 CPU2 CPU3
   0: 35 0 0 0 IR-IO-APIC 2-edge timer
   7: 0 0 0 0 IR-IO-APIC 7-fasteoi pinctrl_amd
   8: 0 0 0 0 IR-IO-APIC 8-edge rtc0
   9: 0 0 0 0 IR-IO-APIC 9-fasteoi acpi
  26: 0 0 0 0 IOMMU-MSI 0-edge AMD-Vi

But s390x's interrupt table looks like this:
$ cat /proc/interrupts
           CPU0 CPU1 CPU2 CPU3
EXT: 8316514 8042540 8950089 10063076
I/O: 250168 299503 271998 262500
AIO: 37784 498 239 128
CLK: 1374966 1261960 1292831 1256303 [EXT] Clock Comparator
EXC: 3968288 2563365 4247636 4204282 [EXT] External Call
EMS: 2973256 4217205 3409621 4602486 [EXT] Emergency Signal
TMR: 0 0 0 0 [EXT] CPU Timer
...

We should consider disabling this test for s390x.

[Frank Heimes (fheimes)]

'+1' on skipping this for s390x