+ selftests-mm-khugepaged-initialize-file-contents-via-mmap-fix.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: flush dirty folio so that drop_caches can work
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-khugepaged-initialize-file-contents-via-mmap-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-khugepaged-initialize-file-contents-via-mmap-fix.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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Zi Yan <ziy@nvidia.com>
Subject: flush dirty folio so that drop_caches can work
Date: Tue, 28 Apr 2026 16:12:08 -0400

Link: https://lore.kernel.org/0FA813EA-5EFA-482F-B8BF-FE65D4169C44@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vineet Agarwal <agarwal.vineet2006@gmail.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/khugepaged.c |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/testing/selftests/mm/khugepaged.c~selftests-mm-khugepaged-initialize-file-contents-via-mmap-fix
+++ a/tools/testing/selftests/mm/khugepaged.c
@@ -394,6 +394,7 @@ static void *file_setup_area(int nr_hpag
 		exit(EXIT_FAILURE);
 	}
 	fill_memory(p, 0, size);
+	msync(p, size, MS_SYNC);
 	close(fd);
 	munmap(p, size);
 	success("OK");
_

Patches currently in -mm which might be from ziy@nvidia.com are

selftests-mm-khugepaged-initialize-file-contents-via-mmap-fix.patch