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mm: add folio_is_pci_p2pdma()

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Reimplement is_pci_p2pdma_page() in terms of folio_is_pci_p2pdma().  Moves
the page_folio() call from inside page_pgmap() to is_pci_p2pdma_page(). 
This removes a page_folio() call from try_grab_folio() which already has a
folio and can pass it in.

Link: https://lkml.kernel.org/r/20250805172307.1302730-12-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2025-08-05 18:23:01 +01:00 committed by Andrew Morton
parent c995ac3aa3
commit 88df6ab2f3
2 changed files with 9 additions and 3 deletions
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10
include/linux/memremap.h
View File

@ -170,11 +170,17 @@ static inline bool is_device_private_page(const struct page *page)
folio_is_device_private(page_folio(page));
}
static inline bool folio_is_pci_p2pdma(const struct folio *folio)
{
return IS_ENABLED(CONFIG_PCI_P2PDMA) &&
folio_is_zone_device(folio) &&
folio->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA;
}
static inline bool is_pci_p2pdma_page(const struct page *page)
{
return IS_ENABLED(CONFIG_PCI_P2PDMA) &&
is_zone_device_page(page) &&
page_pgmap(page)->type == MEMORY_DEVICE_PCI_P2PDMA;
folio_is_pci_p2pdma(page_folio(page));
}
static inline bool folio_is_device_coherent(const struct folio *folio)

2
mm/gup.c
View File

@ -148,7 +148,7 @@ int __must_check try_grab_folio(struct folio *folio, int refs,
if (WARN_ON_ONCE(folio_ref_count(folio) <= 0))
return -ENOMEM;
if (unlikely(!(flags & FOLL_PCI_P2PDMA) && is_pci_p2pdma_page(&folio->page)))
if (unlikely(!(flags & FOLL_PCI_P2PDMA) && folio_is_pci_p2pdma(folio)))
return -EREMOTEIO;
if (flags & FOLL_GET)