[LITMUS^RT] using smp_processor_id()

[Namhoon Kim]

Hi,

I am trying to implement mixed-criticality scheduling plugin. My
implementation is based on P-RES plugin from wip-reservations branch.

The kernel output a warning message "BUG: using smp_processor_id() in
preemptible [00000000] code: mc2spin/945" when a user program calls
sys_complete_job system call. Does anyone know about this message?

Here's the kernel log.

6246 P3: polling_replenish(945): next_replenishment=51360000000
6247 P3: GMP reservation R945 state 3->1 at 51200049993
6248 P3: NEXT_EVENT ADDED at 51220000000
6249 P3: EVENT FOUND at 51220000000, NEW EVENT 51220000000
6250 P3: (mc2spin/945:6) UPDATE_TIMER LV = 2
6255 P3: (mc2spin/945:6) scheduled.
6256 P3: (mc2spin/945:6) migrate from 0
6257 P3: (mc2spin/945:6) stack_in_use=-1
6258 P3: (mc2spin/945:6) mc2_complete_job returns at 51200117663
6348 P3: ^A3BUG: using smp_processor_id() in preemptible [00000000] code:
mc2spin/945
6358 P3: caller is mc2_complete_job+0x1c/0x3b8
6359 P3: ^AdCPU: 3 PID: 945 Comm: mc2spin Not tainted 3.10.31-litmus #418
6360 P3: [<800155d8>] (unwind_backtrace+0x0/0x104) from [<800128ac>]
(show_stack+0x20/0x24)
6361 P3: [<800128ac>] (show_stack+0x20/0x24) from [<8070c37c>]
(dump_stack+0x20/0x28)
6362 P3: [<8070c37c>] (dump_stack+0x20/0x28) from [<80314e70>]
(debug_smp_processor_id+0xcc/0xf0)
6363 P3: [<80314e70>] (debug_smp_processor_id+0xcc/0xf0) from [<802feff0>]
(mc2_complete_job+0x1c/0x3b8)
6364 P3: [<802feff0>] (mc2_complete_job+0x1c/0x3b8) from [<802ebc8c>]
(sys_complete_job+0x54/0x64)
6365 P3: [<802ebc8c>] (sys_complete_job+0x54/0x64) from [<8000e8c0>]
(ret_fast_syscall+0x0/0x30)
6366 P3: (mc2spin/945:6) mc2_complete_job at 51221827554 (deadline:
51245000000) (cur->budget: 0)
6367 P3: (mc2spin/945:7) next_release=51245000000
6368 P3: EVENT FOUND at 51360000000, NEW EVENT 51360000000
6369 P3: (mc2spin/945:7) CLIENT DEPART with budget 0
6370 P3: (mc2spin/945:7) descheduled.
6371 P3: EVENT FOUND at 51360000000, NEW EVENT 51360000000
6399 P3: (mc2spin/945:7) try_to_wake_up() state:1
6401 P3: (mc2spin/945:7) thread wakes up at 51245016173
6403 P3: EVENT FOUND at 51360000000, NEW EVENT 51360000000
6405 P3: (mc2spin/945:7) mc2_resume()
6408 P3: (mc2spin/945:7) try_to_wake_up() done state:0

Thanks,

Namhoon
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