Changeset 10580:6273e4f44a7a
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arm: Fix TLB ignoring faults when table walking

This patch fixes a case where the Minor CPU can deadlock due to the lack
of a response to TLB request because of a bug in fault handling in the ARM
table walker.

TableWalker::processWalkWrapper is the scheduler-called wrapper which
handles deferred walks which calls to TableWalker::wait cannot immediately
process.  The handling of faults generated by processWalk{AArch64,LPAE,}
calls in those two functions is is different.  processWalkWrapper ignores
fault returns from processWalk... which can lead to ::finish not being
called on a translation.

This fix provides fault handling in processWalkWrapper similar to that
found in the leaf functions which BaseTLB::Translation::finish.