Comment 0 for bug 1959610

do_softirq does not exist on preempt RT kernel.

This is causing a failure in ftrace:ftracetest which reports: "echo: I/O error".

Failure is reported for step 32 in Jenkins job:

23:48:45 DEBUG| [stdout] # selftests: ftrace: ftracetest
23:48:45 DEBUG| [stdout] # === Ftrace unit tests ===
23:48:45 DEBUG| [stdout] # [1] Basic trace file check [PASS]
23:48:49 DEBUG| [stdout] # [2] Basic test for tracers [PASS]
23:48:49 DEBUG| [stdout] # [3] Basic trace clock test [PASS]
23:48:49 DEBUG| [stdout] # [4] Basic event tracing check [PASS]
23:48:50 DEBUG| [stdout] # [5] Change the ringbuffer size [PASS]
23:48:50 DEBUG| [stdout] # [6] Snapshot and tracing setting [PASS]
23:48:50 DEBUG| [stdout] # [7] trace_pipe and trace_marker [PASS]
23:49:38 DEBUG| [stdout] # [8] Test ftrace direct functions against tracers [PASS]
23:49:57 DEBUG| [stdout] # [9] Test ftrace direct functions against kprobes [PASS]
23:49:57 DEBUG| [stdout] # [10] Generic dynamic event - add/remove eprobe events [PASS]
23:49:57 DEBUG| [stdout] # [11] Generic dynamic event - add/remove kprobe events [PASS]
23:49:57 DEBUG| [stdout] # [12] Generic dynamic event - add/remove synthetic events [PASS]
23:49:57 DEBUG| [stdout] # [13] Generic dynamic event - selective clear (compatibility) [PASS]
23:49:58 DEBUG| [stdout] # [14] Generic dynamic event - generic clear event [PASS]
23:49:58 DEBUG| [stdout] # [15] Generic dynamic event - check if duplicate events are caught [PASS]
23:49:58 DEBUG| [stdout] # [16] event tracing - enable/disable with event level files [PASS]
23:49:58 DEBUG| [stdout] # [17] event tracing - restricts events based on pid notrace filtering [PASS]
23:49:59 DEBUG| [stdout] # [18] event tracing - restricts events based on pid [PASS]
23:49:59 DEBUG| [stdout] # [19] event tracing - enable/disable with subsystem level files [PASS]
23:50:00 DEBUG| [stdout] # [20] event tracing - enable/disable with top level files [PASS]
23:50:01 DEBUG| [stdout] # [21] Test trace_printk from module [PASS]
23:50:04 DEBUG| [stdout] # [22] ftrace - function graph filters with stack tracer [PASS]
23:50:05 DEBUG| [stdout] # [23] ftrace - function graph filters [PASS]
23:50:06 DEBUG| [stdout] # [24] ftrace - function pid notrace filters [PASS]
23:50:06 DEBUG| [stdout] # [25] ftrace - function pid filters [PASS]
23:50:08 DEBUG| [stdout] # [26] ftrace - stacktrace filter command [PASS]
23:50:08 DEBUG| [stdout] # [27] ftrace - function trace with cpumask [PASS]
23:50:12 DEBUG| [stdout] # [28] ftrace - test for function event triggers [PASS]
23:50:13 DEBUG| [stdout] # [29] ftrace - function trace on module [PASS]
23:50:16 DEBUG| [stdout] # [30] ftrace - function profiling [PASS]
23:50:21 DEBUG| [stdout] # [31] ftrace - function profiler with function tracing [PASS]
23:50:22 DEBUG| [stdout] # [32] ftrace - test reading of set_ftrace_filter [FAIL]
23:50:24 DEBUG| [stdout] # [33] ftrace - test for function traceon/off triggers [PASS]
23:50:24 DEBUG| [stdout] # [34] ftrace - test tracing error log support [PASS]
23:50:28 DEBUG| [stdout] # [35] Test creation and deletion of trace instances while setting an event [PASS]
23:50:29 DEBUG| [stdout] # [36] Test creation and deletion of trace instances [PASS]
23:50:30 DEBUG| [stdout] # [37] Kprobe dynamic event - adding and removing [PASS]
23:50:30 DEBUG| [stdout] # [38] Kprobe dynamic event - busy event check [PASS]
23:50:30 DEBUG| [stdout] # [39] Kprobe dynamic event with arguments [PASS]
23:50:30 DEBUG| [stdout] # [40] Kprobe event with comm arguments [PASS]
23:50:30 DEBUG| [stdout] # [41] Kprobe event string type argument [PASS]
23:50:31 DEBUG| [stdout] # [42] Kprobe event symbol argument [PASS]
23:50:32 DEBUG| [stdout] # [43] Kprobe event argument syntax [PASS]
23:50:32 DEBUG| [stdout] # [44] Kprobes event arguments with types [PASS]
23:50:32 DEBUG| [stdout] # [45] Kprobe event user-memory access [PASS]
23:50:33 DEBUG| [stdout] # [46] Kprobe event auto/manual naming [PASS]
23:50:33 DEBUG| [stdout] # [47] Kprobe dynamic event with function tracer [PASS]
23:50:34 DEBUG| [stdout] # [48] Create/delete multiprobe on kprobe event [PASS]
23:50:34 DEBUG| [stdout] # [49] Kprobe event parser error log check [PASS]
23:50:35 DEBUG| [stdout] # [50] Kretprobe dynamic event with arguments [PASS]
23:50:35 DEBUG| [stdout] # [51] Kretprobe dynamic event with maxactive [PASS]
23:50:35 DEBUG| [stdout] # [52] Kretprobe %return suffix test [PASS]
23:51:00 DEBUG| [stdout] # [53] Register/unregister many kprobe events [PASS]
23:51:00 DEBUG| [stdout] # [54] Kprobe dynamic event - adding and removing [PASS]
23:51:01 DEBUG| [stdout] # [55] Uprobe event parser error log check [PASS]
23:51:01 DEBUG| [stdout] # [56] test for the preemptirqsoff tracer [UNSUPPORTED]
23:51:32 DEBUG| [stdout] # [57] Meta-selftest: Checkbashisms [PASS]
23:51:33 DEBUG| [stdout] # [58] Test wakeup tracer [PASS]
23:51:35 DEBUG| [stdout] # [59] Test wakeup RT tracer [PASS]
23:51:35 DEBUG| [stdout] # [60] event trigger - test inter-event histogram trigger expected fail actions [XFAIL]
23:51:37 DEBUG| [stdout] # [61] event trigger - test field variable support [PASS]
23:51:38 DEBUG| [stdout] # [62] event trigger - test multiple actions on hist trigger [PASS]
23:51:42 DEBUG| [stdout] # [63] event trigger - test inter-event histogram trigger onchange action [PASS]
23:51:46 DEBUG| [stdout] # [64] event trigger - test inter-event histogram trigger onmatch action [PASS]
23:51:51 DEBUG| [stdout] # [65] event trigger - test inter-event histogram trigger onmatch-onmax action [PASS]
23:51:53 DEBUG| [stdout] # [66] event trigger - test inter-event histogram trigger onmax action [PASS]
23:51:58 DEBUG| [stdout] # [67] event trigger - test inter-event histogram trigger snapshot action [PASS]
23:51:58 DEBUG| [stdout] # [68] event trigger - test inter-event histogram trigger eprobe on synthetic event [PASS]
23:52:02 DEBUG| [stdout] # [69] event trigger - test inter-event histogram trigger trace action with dynamic string param [PASS]
23:52:03 DEBUG| [stdout] # [70] event trigger - test synthetic_events syntax parser [PASS]
23:52:03 DEBUG| [stdout] # [71] event trigger - test synthetic_events syntax parser errors [PASS]
23:52:07 DEBUG| [stdout] # [72] event trigger - test inter-event histogram trigger trace action [PASS]
23:52:08 DEBUG| [stdout] # [73] event trigger - test event enable/disable trigger [PASS]
23:52:08 DEBUG| [stdout] # [74] event trigger - test trigger filter [PASS]
23:52:09 DEBUG| [stdout] # [75] event trigger - test histogram modifiers [PASS]
23:52:09 DEBUG| [stdout] # [76] event trigger - test histogram parser errors [PASS]
23:52:09 DEBUG| [stdout] # [77] event trigger - test multiple histogram triggers [PASS]
23:52:09 DEBUG| [stdout] # [78] event trigger - test snapshot-trigger [PASS]
23:52:10 DEBUG| [stdout] # [79] event trigger - test stacktrace-trigger [PASS]
23:52:10 DEBUG| [stdout] # [80] trace_marker trigger - test snapshot trigger [PASS]
23:52:11 DEBUG| [stdout] # [81] trace_marker trigger - test histogram with synthetic event against kernel event [PASS]
23:52:12 DEBUG| [stdout] # [82] trace_marker trigger - test histogram with synthetic event [PASS]
23:52:12 DEBUG| [stdout] # [83] event trigger - test traceon/off trigger [PASS]
23:52:15 DEBUG| [stdout] # [84] (instance) Basic test for tracers [PASS]
23:52:15 DEBUG| [stdout] # [85] (instance) Basic trace clock test [PASS]
23:52:15 DEBUG| [stdout] # [86] (instance) Change the ringbuffer size [PASS]
23:52:16 DEBUG| [stdout] # [87] (instance) Snapshot and tracing setting [PASS]
23:52:16 DEBUG| [stdout] # [88] (instance) trace_pipe and trace_marker [PASS]
23:52:16 DEBUG| [stdout] # [89] (instance) event tracing - enable/disable with event level files [PASS]
23:52:17 DEBUG| [stdout] # [90] (instance) event tracing - restricts events based on pid notrace filtering [PASS]
23:52:17 DEBUG| [stdout] # [91] (instance) event tracing - restricts events based on pid [PASS]
23:52:18 DEBUG| [stdout] # [92] (instance) event tracing - enable/disable with subsystem level files [PASS]
23:52:18 DEBUG| [stdout] # [93] (instance) ftrace - function pid notrace filters [PASS]
23:52:19 DEBUG| [stdout] # [94] (instance) ftrace - function pid filters [PASS]
23:52:21 DEBUG| [stdout] # [95] (instance) ftrace - stacktrace filter command [PASS]
23:52:24 DEBUG| [stdout] # [96] (instance) ftrace - test for function event triggers [PASS]
23:52:26 DEBUG| [stdout] # [97] (instance) ftrace - test for function traceon/off triggers [PASS]
23:52:26 DEBUG| [stdout] # [98] (instance) event trigger - test event enable/disable trigger [PASS]
23:52:27 DEBUG| [stdout] # [99] (instance) event trigger - test trigger filter [PASS]
23:52:27 DEBUG| [stdout] # [100] (instance) event trigger - test histogram modifiers [PASS]
23:52:28 DEBUG| [stdout] # [101] (instance) event trigger - test multiple histogram triggers [PASS]
23:52:28 DEBUG| [stdout] # [102] (instance) trace_marker trigger - test snapshot trigger [PASS]
23:52:28 DEBUG| [stdout] #
23:52:28 DEBUG| [stdout] #
23:52:28 DEBUG| [stdout] # # of passed: 99
23:52:28 DEBUG| [stdout] # # of failed: 1
23:52:28 DEBUG| [stdout] # # of unresolved: 0
23:52:28 DEBUG| [stdout] # # of untested: 0
23:52:28 DEBUG| [stdout] # # of unsupported: 1
23:52:28 DEBUG| [stdout] # # of xfailed: 1
23:52:28 DEBUG| [stdout] # # of undefined(test bug): 0

Output from running test manually:

+ echo do_softirq
./ftracetest: 81: echo: echo: I/O error

# of passed: 0
# of failed: 1
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0