mm: reimplement folio_is_device_private()

For callers of folio_is_device_private(), we save a folio->page->folio
conversion.  Callers of is_device_private_page() simply move the
conversion of page->folio from the implementation of page_pgmap() to
is_device_private_page().

Link: https://lkml.kernel.org/r/20250805172307.1302730-9-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 4aa151914eabbce589e8f62184d1b72631731525..5d18cb7a70e54cbc7ea717b1ba6a3dfc71551126 100644 (file)
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -157,16 +157,17 @@ static inline unsigned long pgmap_vmemmap_nr(struct dev_pagemap *pgmap)
        return 1 << pgmap->vmemmap_shift;
 }
 
-static inline bool is_device_private_page(const struct page *page)
+static inline bool folio_is_device_private(const struct folio *folio)
 {
        return IS_ENABLED(CONFIG_DEVICE_PRIVATE) &&
-               is_zone_device_page(page) &&
-               page_pgmap(page)->type == MEMORY_DEVICE_PRIVATE;
+               folio_is_zone_device(folio) &&
+               folio->pgmap->type == MEMORY_DEVICE_PRIVATE;
 }
 
-static inline bool folio_is_device_private(const struct folio *folio)
+static inline bool is_device_private_page(const struct page *page)
 {
-       return is_device_private_page(&folio->page);
+       return IS_ENABLED(CONFIG_DEVICE_PRIVATE) &&
+               folio_is_device_private(page_folio(page));
 }
 
 static inline bool is_pci_p2pdma_page(const struct page *page)