linux-kernel - [PATCH 01/13] mm/gup.c: Remove redundant check for PCI P2PDMA page

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Date: Thu, 27 Jun 2024 10:54:16 +1000
From: Alistair Popple <apopple@...dia.com>
To: dan.j.williams@...el.com,
	vishal.l.verma@...el.com,
	dave.jiang@...el.com,
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Cc: catalin.marinas@....com,
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	david@...morbit.com,
	Alistair Popple <apopple@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH 01/13] mm/gup.c: Remove redundant check for PCI P2PDMA page

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@...dia.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Acked-by: David Hildenbrand <david@...hat.com>
---
 mm/gup.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index ca0f5ce..669583e 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -3044,11 +3044,6 @@ 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(page, 1, flags);
 		if (!folio) {
 			gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
-- 
git-series 0.9.1