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< FALRU::CacheTracking::check(FALRUBlk *head, FALRUBlk *tail)
---
> FALRU::CacheTracking::check(const FALRUBlk *head, const FALRUBlk *tail) const
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< FALRUBlk* blk = head;
---
> const FALRUBlk* blk = head;