[merged mm-hotfixes-stable] mm-mremap-honour-writable-bit-in-mremap-pte-batching.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-mremap-honour-writable-bit-in-mremap-pte-batching.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mremap: honour writable bit in mremap pte batching
has been removed from the -mm tree.  Its filename was
     mm-mremap-honour-writable-bit-in-mremap-pte-batching.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Dev Jain <dev.jain@arm.com>
Subject: mm/mremap: honour writable bit in mremap pte batching
Date: Tue, 28 Oct 2025 12:09:52 +0530

Currently mremap folio pte batch ignores the writable bit during figuring
out a set of similar ptes mapping the same folio.  Suppose that the first
pte of the batch is writable while the others are not - set_ptes will end
up setting the writable bit on the other ptes, which is a violation of
mremap semantics.  Therefore, use FPB_RESPECT_WRITE to check the writable
bit while determining the pte batch.

Link: https://lkml.kernel.org/r/20251028063952.90313-1-dev.jain@arm.com
Signed-off-by: Dev Jain <dev.jain@arm.com>
Fixes: f822a9a81a31 ("mm: optimize mremap() by PTE batching")
Reported-by: David Hildenbrand <david@redhat.com>
Debugged-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>	[6.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mremap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mremap.c~mm-mremap-honour-writable-bit-in-mremap-pte-batching
+++ a/mm/mremap.c
@@ -187,7 +187,7 @@ static int mremap_folio_pte_batch(struct
 	if (!folio || !folio_test_large(folio))
 		return 1;
 
-	return folio_pte_batch(folio, ptep, pte, max_nr);
+	return folio_pte_batch_flags(folio, NULL, ptep, &pte, max_nr, FPB_RESPECT_WRITE);
 }
 
 static int move_ptes(struct pagetable_move_control *pmc,
_

Patches currently in -mm which might be from dev.jain@arm.com are