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wrote: > From: Matthew Brost > > Add free_zone_device_folio_prepare(), a helper that restores large > ZONE_DEVICE folios to a sane, initial state before freeing them. > > Compound ZONE_DEVICE folios overwrite per-page state (e.g. pgmap and > compound metadata). Before returning such pages to the device pgmap > allocator, each constituent page must be reset to a standalone > ZONE_DEVICE folio with a valid pgmap and no compound state. > > Use this helper prior to folio_free() for device-private and > device-coherent folios to ensure consistent device page state for > subsequent allocations. > > Fixes: d245f9b4ab80 ("mm/zone_device: support large zone device private folios") > Cc: Zi Yan > Cc: David Hildenbrand > Cc: Oscar Salvador > Cc: Andrew Morton > Cc: Balbir Singh > Cc: Lorenzo Stoakes > Cc: Liam R. Howlett > Cc: Vlastimil Babka > Cc: Mike Rapoport > Cc: Suren Baghdasaryan > Cc: Michal Hocko > Cc: Alistair Popple > Cc: linux-mm@kvack.org > Cc: linux-cxl@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Suggested-by: Alistair Popple > Signed-off-by: Matthew Brost > Signed-off-by: Francois Dugast > --- > include/linux/memremap.h | 1 + > mm/memremap.c | 55 ++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 56 insertions(+) > > diff --git a/include/linux/memremap.h b/include/linux/memremap.h > index 97fcffeb1c1e..88e1d4707296 100644 > --- a/include/linux/memremap.h > +++ b/include/linux/memremap.h > @@ -230,6 +230,7 @@ static inline bool is_fsdax_page(const struct page *page) > > #ifdef CONFIG_ZONE_DEVICE > void zone_device_page_init(struct page *page, unsigned int order); > +void free_zone_device_folio_prepare(struct folio *folio); > void *memremap_pages(struct dev_pagemap *pgmap, int nid); > void memunmap_pages(struct dev_pagemap *pgmap); > void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap); > diff --git a/mm/memremap.c b/mm/memremap.c > index 39dc4bd190d0..375a61e18858 100644 > --- a/mm/memremap.c > +++ b/mm/memremap.c > @@ -413,6 +413,60 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn) > } > EXPORT_SYMBOL_GPL(get_dev_pagemap); > > +/** > + * free_zone_device_folio_prepare() - Prepare a ZONE_DEVICE folio for freeing. > + * @folio: ZONE_DEVICE folio to prepare for release. > + * > + * ZONE_DEVICE pages/folios (e.g., device-private memory or fsdax-backed pages) > + * can be compound. When freeing a compound ZONE_DEVICE folio, the tail pages > + * must be restored to a sane ZONE_DEVICE state before they are released. > + * > + * This helper: > + * - Clears @folio->mapping and, for compound folios, clears each page's > + * compound-head state (ClearPageHead()/clear_compound_head()). > + * - Resets the compound order metadata (folio_reset_order()) and then > + * initializes each constituent page as a standalone ZONE_DEVICE folio: > + * * clears ->mapping > + * * restores ->pgmap (prep_compound_page() overwrites it) > + * * clears ->share (only relevant for fsdax; unused for device-private) > + * > + * If @folio is order-0, only the mapping is cleared and no further work is > + * required. > + */ > +void free_zone_device_folio_prepare(struct folio *folio) > +{ > + struct dev_pagemap *pgmap = page_pgmap(&folio->page); > + int order, i; > + > + VM_WARN_ON_FOLIO(!folio_is_zone_device(folio), folio); > + > + folio->mapping = NULL; > + order = folio_order(folio); > + if (!order) > + return; > + > + folio_reset_order(folio); > + > + for (i = 0; i < (1UL << order); i++) { > + struct page *page = folio_page(folio, i); > + struct folio *new_folio = (struct folio *)page; > + > + ClearPageHead(page); > + clear_compound_head(page); > + > + new_folio->mapping = NULL; > + /* > + * Reset pgmap which was over-written by > + * prep_compound_page(). > + */ > + new_folio->pgmap = pgmap; > + new_folio->share = 0; /* fsdax only, unused for device private */ > + VM_WARN_ON_FOLIO(folio_ref_count(new_folio), new_folio); > + VM_WARN_ON_FOLIO(!folio_is_zone_device(new_folio), new_folio); Does calling the free_folio() callback on new_folio solve the issue you are facing, or is that PMD_ORDER more frees than we'd like? > + } > +} > +EXPORT_SYMBOL_GPL(free_zone_device_folio_prepare); > + > void free_zone_device_folio(struct folio *folio) > { > struct dev_pagemap *pgmap = folio->pgmap; > @@ -454,6 +508,7 @@ void free_zone_device_folio(struct folio *folio) > case MEMORY_DEVICE_COHERENT: > if (WARN_ON_ONCE(!pgmap->ops || !pgmap->ops->folio_free)) > break; > + free_zone_device_folio_prepare(folio); > pgmap->ops->folio_free(folio, order); > percpu_ref_put_many(&folio->pgmap->ref, nr); > break; Balbir