+ mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set.patch added to mm-hotfixes-unstable branch

+ mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/huge_memory: ensure huge_zero_folio won't have large_rmappable flag set
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set.patch

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

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/huge_memory: ensure huge_zero_folio won't have large_rmappable flag set
Date: Sat, 14 Sep 2024 09:53:06 +0800

Ensure huge_zero_folio won't have large_rmappable flag set.  So it can be
reported as thp,zero correctly through stable_page_flags().

Link: https://lkml.kernel.org/r/20240914015306.3656791-1-linmiaohe@huawei.com
Fixes: 5691753d73a2 ("mm: convert huge_zero_page to huge_zero_folio")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/huge_memory.c~mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set
+++ a/mm/huge_memory.c
@@ -220,6 +220,8 @@ retry:
 		count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED);
 		return false;
 	}
+	/* Ensure zero folio won't have large_rmappable flag set. */
+	folio_clear_large_rmappable(zero_folio);
 	preempt_disable();
 	if (cmpxchg(&huge_zero_folio, NULL, zero_folio)) {
 		preempt_enable();
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-huge_memory-ensure-huge_zero_folio-wont-have-large_rmappable-flag-set.patch
mm-memory-failure-fix-vm_bug_on_pagepagepoisonedpage-when-unpoison-memory.patch