[Bug runtime/20192] "suspicious RCU usage." warning from kernel when running testsuite

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20192

David Smith <dsmith at redhat dot com> changed:

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                 CC|                            |dsmith at redhat dot com

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Created attachment 9314
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9314&action=edit
potential patch

Here's a potential patch to fix this issue. It marks the contexts array with
'__rcu' and makes sure all accesses to it use the rcu functions.

I'm a bit unsure if the addition of rcu_read_lock()/rcu_read_unlock() is truly
necessary in _stp_runtime_context_wait().

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