Locking API testsuite

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Hello Everybody,

My dmesg showing:

[    0.000999] ------------------------
[    0.000999] | Locking API testsuite:
[    0.000999] ----------------------------------------------------------------------------
[    0.000999]                                  | spin |wlock |rlock
|mutex | wsem | rsem |
[    0.000999]
--------------------------------------------------------------------------
[    0.000999]                      A-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]                  A-B-B-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]              A-B-B-C-C-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]              A-B-C-A-B-C deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]          A-B-B-C-C-D-D-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]          A-B-C-D-B-D-D-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]          A-B-C-D-B-C-D-A deadlock:failed|failed|  ok
|failed|failed|failed|
[    0.000999]                     double
unlock:failed|failed|failed|failed|failed|failed|
[    0.000999]                   initialize
held:failed|failed|failed|failed|failed|failed|
[    0.000999]                  bad unlock order:  ok  |  ok  |  ok  |
 ok  |  ok  |  ok  |
[    0.000999]
--------------------------------------------------------------------------
[    0.000999]               recursive read-lock:             |  ok  |
            |failed|
[    0.000999]            recursive read-lock #2:             |  ok  |
            |failed|
[    0.000999]             mixed read-write-lock:             |failed|
            |failed|
[    0.000999]             mixed write-read-lock:             |failed|
            |failed|
[    0.000999]
--------------------------------------------------------------------------
[    0.000999]      hard-irqs-on + irq-safe-A/12:failed|failed|  ok  |
[    0.000999]      soft-irqs-on + irq-safe-A/12:failed|failed|  ok  |
[    0.000999]      hard-irqs-on + irq-safe-A/21:failed|failed|  ok  |
[    0.000999]      soft-irqs-on + irq-safe-A/21:failed|failed|  ok  |
[    0.000999]        sirq-safe-A => hirqs-on/12:failed|failed|  ok  |
[    0.000999]        sirq-safe-A => hirqs-on/21:failed|failed|  ok  |
[    0.000999]          hard-safe-A + irqs-on/12:failed|failed|  ok  |
[    0.000999]          soft-safe-A + irqs-on/12:failed|failed|  ok  |
[    0.000999]          hard-safe-A + irqs-on/21:failed|failed|  ok  |
[    0.000999]          soft-safe-A + irqs-on/21:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/123:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/123:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/132:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/132:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/213:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/213:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/231:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/231:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/312:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/312:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #1/321:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #1/321:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/123:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/123:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/132:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/132:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/213:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/213:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/231:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/231:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/312:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/312:failed|failed|  ok  |
[    0.000999]     hard-safe-A + unsafe-B #2/321:failed|failed|  ok  |
[    0.000999]     soft-safe-A + unsafe-B #2/321:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/123:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/123:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/132:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/132:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/213:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/213:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/231:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/231:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/312:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/312:failed|failed|  ok  |
[    0.000999]       hard-irq lock-inversion/321:failed|failed|  ok  |
[    0.000999]       soft-irq lock-inversion/321:failed|failed|  ok  |
[    0.000999]       hard-irq read-recursion/123:  ok  |
[    0.000999]       soft-irq read-recursion/123:  ok  |
[    0.000999]       hard-irq read-recursion/132:  ok  |
[    0.000999]       soft-irq read-recursion/132:  ok  |
[    0.000999]       hard-irq read-recursion/213:  ok  |
[    0.000999]       soft-irq read-recursion/213:  ok  |
[    0.000999]       hard-irq read-recursion/231:  ok  |
[    0.000999]       soft-irq read-recursion/231:  ok  |
[    0.000999]       hard-irq read-recursion/312:  ok  |
[    0.000999]       soft-irq read-recursion/312:  ok  |
[    0.000999]       hard-irq read-recursion/321:  ok  |
[    0.000999]       soft-irq read-recursion/321:  ok  |
[    0.000999] --------------------------------------------------------
[    0.000999] 145 out of 218 testcases failed, as expected. |
[    0.000999] ----------------------------------------------------

Questions:

what is the purposes of these test cases?   And all these failures
what does it mean?   (presumably turned on after
config_debug_locking_api_selftests=y in .config file, right?)


-- 
Regards,
Peter Teoh

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