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However a future change will cause these > > checks to be invalid for FS DAX pages so make > > folio_is_longterm_pinnable() return false for FS DAX pages. > > > > Signed-off-by: Alistair Popple > > --- > > include/linux/memremap.h | 11 +++++++++++ > > include/linux/mm.h | 4 ++++ > > 2 files changed, 15 insertions(+) > > > > diff --git a/include/linux/memremap.h b/include/linux/memremap.h > > index 14273e6..6a1406a 100644 > > --- a/include/linux/memremap.h > > +++ b/include/linux/memremap.h > > @@ -187,6 +187,17 @@ static inline bool folio_is_device_coherent(const struct folio *folio) > > return is_device_coherent_page(&folio->page); > > } > > > > +static inline bool is_device_dax_page(const struct page *page) > > +{ > > + return is_zone_device_page(page) && > > + page_dev_pagemap(page)->type == MEMORY_DEVICE_FS_DAX; > > +} > > + > > +static inline bool folio_is_device_dax(const struct folio *folio) > > +{ > > + return is_device_dax_page(&folio->page); > > +} > > + > > #ifdef CONFIG_ZONE_DEVICE > > void zone_device_page_init(struct page *page); > > void *memremap_pages(struct dev_pagemap *pgmap, int nid); > > diff --git a/include/linux/mm.h b/include/linux/mm.h > > index ae6d713..935e493 100644 > > --- a/include/linux/mm.h > > +++ b/include/linux/mm.h > > @@ -1989,6 +1989,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio) > > if (folio_is_device_coherent(folio)) > > return false; > > > > + /* DAX must also always allow eviction. */ > > + if (folio_is_device_dax(folio)) > > Why is this called "folio_is_device_dax()" when the check is for fsdax? > > I would expect: > > if (folio_is_fsdax(folio)) > return false; > > ...and s/device_dax/fsdax/ for the rest of the helpers. Specifically devdax is ok to allow longterm pinning since it is statically allocated. fsdax is the only ZONE_DEVICE mode where there is a higher-level allocator that does not support a 3rd party the block its operations indefinitely with a pin. So this needs to be explicit for that case.