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epoch: with EPOCH_TRACE add epoch_where_report()

Description

epoch: with EPOCH_TRACE add epoch_where_report()
which will report where the epoch was entered and also
mark the tracker, so that exit will also be reported.

Helps to understand epoch entrance/exit scenarios in
complex cases, like network stack. As everything else
under EPOCH_TRACE it is a developer only tool.

Details

Provenance
glebiusAuthored on Dec 2 2021, 6:59 PM
Parents
R10:9e93d2b335a0: ifnet: enable & fix if_debug build
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