In preparation for relaxing the conditions under which we wait to allow waiting on the GPU from any context (e.g. holding nearly any other mutex) is to remove taking struct_mutex from inside GPU reset. The issue being that any mutex required for GPU reset is required to avoid indefinite waits while waiting on the GPU -- so any mutex on which we wait, may not be used inside reset (or the shrinker). struct_mutex circumvents this requirement by complicated recursion avoidance, a lesson we do not want to repeat. -chris
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