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Since in the next patch you also unify madvise and khugepaged, removing hpage_collapse prefix would make sense, but then I tend to agree with Liam that dropping the prefix altogether is better. Having all the functions in khugepaged.c prefixed with khugepaged_ seems unnecessary work. @David, I forgot where you replied but I remember you saying that we should not introduce MADV_COLLAPSE mTHP support for now?