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Date:   Fri, 28 Apr 2023 00:41:35 +0000
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Subject: [RFC PATCH v1 3/7] mm: publish raw_hwp_page in mm.h
From:   Jiaqi Yan <jiaqiyan@google.com>
To:     mike.kravetz@oracle.com, peterx@redhat.com, naoya.horiguchi@nec.com
Cc:     songmuchun@bytedance.com, duenwen@google.com,
        axelrasmussen@google.com, jthoughton@google.com,
        rientjes@google.com, linmiaohe@huawei.com, shy828301@gmail.com,
        baolin.wang@linux.alibaba.com, wangkefeng.wang@huawei.com,
        akpm@linux-foundation.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Jiaqi Yan <jiaqiyan@google.com>
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raw_hwp_page will be needed by HugeTLB to determine if a raw subpage
in a hugepage is poisoned and either should be unmapped or not
faulted in at PAGE_SIZE PTE level

Signed-off-by: Jiaqi Yan <jiaqiyan@google.com>
---
 include/linux/mm.h  | 16 ++++++++++++++++
 mm/memory-failure.c | 13 -------------
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d3216b4284a..4496d7bdd3ea 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3522,6 +3522,22 @@ enum mf_action_page_type {
  */
 extern const struct attribute_group memory_failure_attr_group;
 
+#ifdef CONFIG_HUGETLB_PAGE
+/*
+ * Struct raw_hwp_page represents information about "raw error page",
+ * constructing singly linked list from ->_hugetlb_hwpoison field of folio.
+ */
+struct raw_hwp_page {
+	struct llist_node node;
+	struct page *page;
+};
+
+static inline struct llist_head *raw_hwp_list_head(struct folio *folio)
+{
+	return (struct llist_head *)&folio->_hugetlb_hwpoison;
+}
+#endif
+
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 extern void clear_huge_page(struct page *page,
 			    unsigned long addr_hint,
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index eb5579b6787e..48e62d04af17 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1826,19 +1826,6 @@ EXPORT_SYMBOL_GPL(mf_dax_kill_procs);
 #endif /* CONFIG_FS_DAX */
 
 #ifdef CONFIG_HUGETLB_PAGE
-/*
- * Struct raw_hwp_page represents information about "raw error page",
- * constructing singly linked list from ->_hugetlb_hwpoison field of folio.
- */
-struct raw_hwp_page {
-	struct llist_node node;
-	struct page *page;
-};
-
-static inline struct llist_head *raw_hwp_list_head(struct folio *folio)
-{
-	return (struct llist_head *)&folio->_hugetlb_hwpoison;
-}
 
 static unsigned long __folio_free_raw_hwp(struct folio *folio, bool move_flag)
 {
-- 
2.40.1.495.gc816e09b53d-goog