diff mbox series

[v4,09/25] mm/gup.c: Remove redundant check for PCI P2PDMA page

Message ID 3f20b8d258d4eb72e1eadd5926d892bc61f0e0d4.1734407924.git-series.apopple@nvidia.com (mailing list archive)
State New
Headers show
Series fs/dax: Fix ZONE_DEVICE page reference counts | expand

Commit Message

Alistair Popple Dec. 17, 2024, 5:12 a.m. UTC 
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(-)

Comments

David Hildenbrand Dec. 17, 2024, 10:06 p.m. UTC | #1 
On 17.12.24 06:12, Alistair Popple wrote:
> 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>
> ---

Nit: patch subject should start with "mm/gup: ...".
diff mbox series

Patch

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);