RFC fix RCU stall warning on ARM
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- v1 RFC Latest2 patches 4 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | ARM version of arch_trigger_all_cpu_backtrace()arch/ arch/ arch/ | +76 | 0 replies | |
| 2/2 | let RCU stall messages escape with CONFIG_PREEMPT_RT_FULLkernel/ kernel/ | +17 | 2 replies |
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Cover letter [PATCH RT 0/2][RFC] fix RCU stall warning on ARM
The RCU stall warning functions call trigger_all_cpu_backtrace() to print a backtrace on each cpu. This function is only implemented for x86. Add a version for ARM.
With CONFIG_PREEMPT_RT_FULL enabled, flushing the output from printk() is inhibited in some contexts to avoid increasing real time latencies. The RCU stall warnings are inhibited on ARM due to this feature. (I have not tested whether this is also the case on other architectures.) Add back the oops_in_progress flag to allow the RCU stall warnings to print immediately.
A third patch contains test scaffolding to force the stall warnings to occur so that the other patches can be tested. The third patch should __not__ added to the mainline RT PREEMPT patch tree.
These patches apply to 3.6.7-rt18. They do not apply cleanly to 3.0.xx.