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Removing entries from an open addressed hash table creates holes in the collision chains, preventing previous colliding entries to be found. By inserting tombstones, rather than clearing deleted entries makes it possible to distinguish the end of a chain from a hole. Reviewed-by: Arun Kumar Neelakantam <aneela@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>