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> >>> +} > >>> +EXPORT_SYMBOL_GPL(dax_insert_pfn_pmd); > >> > >> Like I mentioned before, lets make the exported function > >> vmf_insert_folio() and move the pte, pmd, pud internal private / static > >> details of the implementation. The "dax_" specific aspect of this was > >> removed at the conversion of a dax_pfn to a folio. > > > > Ok, let me try that. Note that vmf_insert_pfn{_pmd|_pud} will have to > > stick around though. > > Creating a single vmf_insert_folio() seems somewhat difficult because it > needs to be called from multiple fault paths (either PTE, PMD or PUD > fault) and do something different for each. > > Specifically the issue I ran into is that DAX does not downgrade PMD > entries to PTE entries if they are backed by storage. So the PTE fault > handler will get a PMD-sized DAX entry and therefore a PMD size folio. > > The way I tried implementing vmf_insert_folio() was to look at > folio_order() to determine which internal implementation to call. But > that doesn't work for a PTE fault, because there's no way to determine > if we should PTE map a subpage or PMD map the entire folio. Ah, that conflict makes sense. > We could pass down some context as to what type of fault we're handling, > or add it to the vmf struct, but that seems excessive given callers > already know this and could just call a specific > vmf_insert_page_{pte|pmd|pud}. Ok, I think it is good to capture that "because dax does not downgrade entries it may satisfy PTE faults with PMD inserts", or something like that in comment or changelog.