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* [merged mm-stable] docs-mm-damon-design-document-damon-actions-when-transparent_hugepage-is-off.patch removed from -mm tree
@ 2026-03-29  0:41 Andrew Morton
  0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2026-03-29  0:41 UTC (permalink / raw)
  To: mm-commits, sj, gutierrez.asier, akpm


The quilt patch titled
     Subject: Docs/mm/damon/design: document DAMON actions when TRANSPARENT_HUGEPAGE is off
has been removed from the -mm tree.  Its filename was
     docs-mm-damon-design-document-damon-actions-when-transparent_hugepage-is-off.patch

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

------------------------------------------------------
From: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Subject: Docs/mm/damon/design: document DAMON actions when TRANSPARENT_HUGEPAGE is off
Date: Tue, 17 Mar 2026 20:53:47 -0700

MADV_HUGEPAGE and MADV_NOHUGEPAGE are guarded and they are not available
when compiling the kernel without TRANSPARENT_HUGEPAGE option.  The DAMON
behaviour is to silently fail [1] in when DAMOS_HUGEPAGE or
DAMOS_NOHUGEPAGE are used, but TRANSPARENT_HUGEPAGE is disabled.  Update
the DAMON documentation to reflect this behaviour.

Link: https://lkml.kernel.org/r/20260318035349.88715-1-sj@kernel.org
Link: https://lore.kernel.org/66131775-180b-4b9f-b7ce-61a3e077b6e6@huawei-partners.com/ [1]
Signed-off-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/mm/damon/design.rst |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/Documentation/mm/damon/design.rst~docs-mm-damon-design-document-damon-actions-when-transparent_hugepage-is-off
+++ a/Documentation/mm/damon/design.rst
@@ -460,9 +460,13 @@ that supports each action are as below.
  - ``pageout``: Reclaim the region.
    Supported by ``vaddr``, ``fvaddr`` and ``paddr`` operations set.
  - ``hugepage``: Call ``madvise()`` for the region with ``MADV_HUGEPAGE``.
-   Supported by ``vaddr`` and ``fvaddr`` operations set.
+   Supported by ``vaddr`` and ``fvaddr`` operations set. When
+   TRANSPARENT_HUGEPAGE is disabled, the application of the action will just
+   fail.
  - ``nohugepage``: Call ``madvise()`` for the region with ``MADV_NOHUGEPAGE``.
-   Supported by ``vaddr`` and ``fvaddr`` operations set.
+   Supported by ``vaddr`` and ``fvaddr`` operations set. When
+   TRANSPARENT_HUGEPAGE is disabled, the application of the action will just
+   fail.
  - ``lru_prio``: Prioritize the region on its LRU lists.
    Supported by ``paddr`` operations set.
  - ``lru_deprio``: Deprioritize the region on its LRU lists.
_

Patches currently in -mm which might be from gutierrez.asier@huawei-partners.com are



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2026-03-29  0:41 [merged mm-stable] docs-mm-damon-design-document-damon-actions-when-transparent_hugepage-is-off.patch removed from -mm tree Andrew Morton

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