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U2FsdGVkX19HszJ0j11BDgYb4lp6o8AXz2MsGEthi/+o8/U6beDt6jUEYU+xs+levBWuh0b/DZEzWYtoXN+9JwCEROLFa6BMCTlxdVSBdPCRqP9d5ZV92PR1dOPbSoIvHMu8s/6EA8+bf+foEOOJOwF6B6hnj46tOuUv+8uZ5ZdveXQrzVgmoFAQXcAtsfcRQk/DVtCgx3QLmvyxD//6yP2W1n9aDUzgycrogqU5OMdmOj9MFOe3e0u9HybDjXp7tOU0TQmT2LbJ09nQjqOR0u0qWWVGlQP/Pvsz6vw4k6Mlu8spTtTGoqfSsNFHW0pmW19Zd3dQSSbHmspUACPSdIoI8lzbalITfKikCTwpkq12FwBdI7w88+zMqxmeIgixPYYvEjGEt/pBSnW7vCmNzkH2RSih3phCA3u454xfAOBWXd/gPrtqs6lOEL+MW0eg6DnuUqgyB0Xy9ujLGKhEiX6gTxEBI6NXek6qehZLegm4k5OpxQLCjgpByTVi7BJBM6hq6SJzju4bIiPMKBDiA0WCVgTOdIKaRdhullcxetTkY3El6weLq0BSAbpo2nXxsvIA9nxiiHTClELdZCnjRxy3DyY5nhGEe+ktASbu4q5logu6lL7hGw2rvCa/ulIqgy4Bu6X+/GESAyKS8hqdEsgnQv1W9jsh3cCWlwcGEWXTxmpjuPYKjcRXpR/I1BcHZ1OEts/1pEc8TxwStBCd/L9zWmbKVPrjZCxT0w2bYVzu9Cpkq829A5ZufDk38muoiTYKFRe1QOyO5knAK9U6K6S2FGIanBvNRo8L0MydSRWPSjFadb5jKzoM3UtfgLSj+4lijVIMjQ5ySHohvMNnUopXUxbkSRZ91AcW4vCrHXEYvH+uapNAWh6IPKLBt5aGEjS5bsHyuiaVKgBGdXMxQOwDkrJJl2TJs9yt0XQeUIaJPu/ppukIXmyL0IJf3kxt+BayD1BnFPKqRUUAeCi TwMIXTMK 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HPAGE_PMD_SIZE))) { >> + migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE | >> + MIGRATE_PFN_COMPOUND; >> + migrate->dst[migrate->npages] = 0; >> + migrate->npages++; >> + migrate->cpages++; > > It's a bit unclear what cpages and npages actually represent when > collecting a THP. In my opinion, they should reflect the total number of > minimum sized pages collected—i.e., we should increment by the shifted > order (512) here. I'm fairly certain the logic in migrate_device.c would > break if a 4MB range was requested and a THP was found first, followed by a > non-THP. > cpages and npages represent entries in the array and when or'ed with MIGRATE_PFN_COMPOUND represent the right number of entries populated. If you have a test that shows the breakage, I'd be keen to see it. We do populate other entries in 4k size(s) when collecting to allow for a split of the folio. Thanks for the review, Balbir Singh