+ mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf.patch added to mm-new branch

+ mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm: gup: move pmd_protnone() into gup_fast_pmd_leaf()
has been added to the -mm mm-new branch.  Its filename is
     mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Aristeu Rozanski <aris@ruivo.org>
Subject: mm: gup: move pmd_protnone() into gup_fast_pmd_leaf()
Date: Thu, 27 Aug 2026 21:55:43 -0400

Patch series "mm: gup: cleanup gup_fast call chain", v3.

These two patches implement the refactor in gup_fast call chain David
Hildenbrand mentioned in [1].


This patch (of 2):	

Make pmd handling match pud handling by calling pmd_protnone() inside
gup_fast_pmd_leaf().

Link: https://lore.kernel.org/20260828015542.125576330@ruivo.org
Link: https://lore.kernel.org/20260828015542.245315718@ruivo.org
Link: https://lore.kernel.org/all/85e760cf-b994-40db-8d13-221feee55c60@redhat.com/T/#u [1]
Signed-off-by: Aristeu Rozanski <aris@ruivo.org>
Suggested-by: David Hildenbrand <david@kernel.org>
Link: https://lore.kernel.org/all/85e760cf-b994-40db-8d13-221feee55c60@redhat.com/T/#u
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/gup.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/mm/gup.c~mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf
+++ a/mm/gup.c
@@ -2929,6 +2929,10 @@ static int gup_fast_pmd_leaf(pmd_t orig,
 	struct folio *folio;
 	int refs;
 
+	/* See gup_fast_pte_range() */
+	if (pmd_protnone(orig))
+		return 0;
+
 	if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
 		return 0;
 
@@ -3024,10 +3028,6 @@ static int gup_fast_pmd_range(pud_t *pud
 			return 0;
 
 		if (unlikely(pmd_leaf(pmd))) {
-			/* See gup_fast_pte_range() */
-			if (pmd_protnone(pmd))
-				return 0;
-
 			if (!gup_fast_pmd_leaf(pmd, pmdp, addr, next, flags,
 				pages, nr))
 				return 0;
_

Patches currently in -mm which might be from aris@ruivo.org are

mm-gup-move-pmd_protnone-into-gup_fast_pmd_leaf.patch
mm-gup-cleanup-the-gup_fast_-call-chain.patch