[PATCH v6 09/26] mm/gup: Remove redundant check for PCI P2PDMA page

Alistair Popple
2025-01-10T06:17:31Z

PCI P2PDMA pages are not mapped with pXX_devmap PTEs therefore the
check in __gup_device_huge() is redundant. Remove it

Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Dan Wiliams <dan.j.williams@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
---
mm/gup.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 2304175..9b587b5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -3016,11 +3016,6 @@ static int gup_fast_devmap_leaf(unsigned long pfn, unsigned long addr,
break;
}

- if (!(flags & FOLL_PCI_P2PDMA) && is_pci_p2pdma_page(page)) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- break;
- }
-
folio = try_grab_folio_fast(page, 1, flags);
if (!folio) {
gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
--
git-series 0.9.1