[PATCH 01/12] mm/gup.c: Remove redundant check for PCI P2PDMA page
From: Alistair Popple <apopple@nvidia.com>
Date: 2024-09-10 04:15:01
Also in:
linux-arm-kernel, linux-cxl, linux-doc, linux-ext4, linux-fsdevel, linux-mm, linux-xfs, lkml, nvdimm
Subsystem:
memory management, memory management - gup (get user pages), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
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> Acked-by: David Hildenbrand <redacted> --- mm/gup.c | 5 ----- 1 file changed, 5 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c
index d19884e..5d2fc9a 100644
--- a/mm/gup.c
+++ b/mm/gup.c@@ -2954,11 +2954,6 @@ 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);
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