[PATCH v6 17/26] memremap: Add is_devdax_page() and is_fsdax_page() helpers
From: Alistair Popple <apopple@nvidia.com>
Date: 2025-01-10 06:02:51
Also in:
linux-arm-kernel, linux-cxl, linux-doc, linux-ext4, linux-fsdevel, linux-mm, linux-xfs, lkml, loongarch, nvdimm
Subsystem:
memory hot(un)plug, the rest · Maintainers:
David Hildenbrand, Oscar Salvador, Linus Torvalds
Add helpers to determine if a page or folio is a devdax or fsdax page or folio. Signed-off-by: Alistair Popple <apopple@nvidia.com> Acked-by: David Hildenbrand <redacted> --- Changes for v5: - Renamed is_device_dax_page() to is_devdax_page() for consistency. --- include/linux/memremap.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 0256a42..54e8b57 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h@@ -187,6 +187,28 @@ static inline bool folio_is_device_coherent(const struct folio *folio) return is_device_coherent_page(&folio->page); } +static inline bool is_fsdax_page(const struct page *page) +{ + return is_zone_device_page(page) && + page_pgmap(page)->type == MEMORY_DEVICE_FS_DAX; +} + +static inline bool folio_is_fsdax(const struct folio *folio) +{ + return is_fsdax_page(&folio->page); +} + +static inline bool is_devdax_page(const struct page *page) +{ + return is_zone_device_page(page) && + page_pgmap(page)->type == MEMORY_DEVICE_GENERIC; +} + +static inline bool folio_is_devdax(const struct folio *folio) +{ + return is_devdax_page(&folio->page); +} + #ifdef CONFIG_ZONE_DEVICE void zone_device_page_init(struct page *page); void *memremap_pages(struct dev_pagemap *pgmap, int nid);
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