+ mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper.patch added to mm-unstable branch

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

The patch titled
     Subject: mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper
has been added to the -mm mm-unstable branch.  Its filename is
     mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper.patch

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

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------------------------------------------------------
From: Jinjiang Tu <tujinjiang@huawei.com>
Subject: mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper
Date: Tue, 18 Mar 2025 16:39:38 +0800

Patch series "mm/vmscan: don't try to reclaim hwpoison folio".

Fix a bug during memory reclaim if folio is hwpoisoned.


This patch (of 2):

Introduce helper folio_contain_hwpoisoned_page() to check if the entire
folio is hwpoisoned or it contains hwpoisoned pages.

Link: https://lkml.kernel.org/r/20250318083939.987651-1-tujinjiang@huawei.com
Link: https://lkml.kernel.org/r/20250318083939.987651-2-tujinjiang@huawei.com
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: <stable@vger,kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/page-flags.h |    6 ++++++
 mm/memory_hotplug.c        |    3 +--
 mm/shmem.c                 |    3 +--
 3 files changed, 8 insertions(+), 4 deletions(-)

--- a/include/linux/page-flags.h~mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper
+++ a/include/linux/page-flags.h
@@ -1135,6 +1135,12 @@ static inline bool is_page_hwpoison(cons
 	return folio_test_hugetlb(folio) && PageHWPoison(&folio->page);
 }
 
+static inline bool folio_contain_hwpoisoned_page(struct folio *folio)
+{
+	return folio_test_hwpoison(folio) ||
+	    (folio_test_large(folio) && folio_test_has_hwpoisoned(folio));
+}
+
 bool is_free_buddy_page(const struct page *page);
 
 PAGEFLAG(Isolated, isolated, PF_ANY);
--- a/mm/memory_hotplug.c~mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper
+++ a/mm/memory_hotplug.c
@@ -1828,8 +1828,7 @@ static void do_migrate_range(unsigned lo
 		if (unlikely(page_folio(page) != folio))
 			goto put_folio;
 
-		if (folio_test_hwpoison(folio) ||
-		    (folio_test_large(folio) && folio_test_has_hwpoisoned(folio))) {
+		if (folio_contain_hwpoisoned_page(folio)) {
 			if (WARN_ON(folio_test_lru(folio)))
 				folio_isolate_lru(folio);
 			if (folio_mapped(folio)) {
--- a/mm/shmem.c~mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper
+++ a/mm/shmem.c
@@ -3290,8 +3290,7 @@ shmem_write_begin(struct file *file, str
 	if (ret)
 		return ret;
 
-	if (folio_test_hwpoison(folio) ||
-	    (folio_test_large(folio) && folio_test_has_hwpoisoned(folio))) {
+	if (folio_contain_hwpoisoned_page(folio)) {
 		folio_unlock(folio);
 		folio_put(folio);
 		return -EIO;
_

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

mm-contig_alloc-fix-alloc_contig_range-when-__gfp_comp-and-order-max_order.patch
mm-hwpoison-introduce-folio_contain_hwpoisoned_page-helper.patch
mm-vmscan-dont-try-to-reclaim-hwpoison-folio.patch