From d027122d8363e58cd8bc2fa6a16917f7f69b85bb Mon Sep 17 00:00:00 2001
From: Naoya Horiguchi <naoya.horiguchi@nec.com>
Date: Mon, 24 Oct 2022 15:20:10 +0900
Subject: [PATCH] mm/hwpoison: move definitions of num_poisoned_pages_* to
 memory-failure.c

These interfaces will be used by drivers/base/memory.c by later patch, so
as a preparatory work move them to more common header file visible to the
file.

Link: https://lkml.kernel.org/r/20221024062012.1520887-3-naoya.horiguchi@linux.dev
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 arch/parisc/kernel/pdt.c |  3 +--
 include/linux/mm.h       |  5 +++++
 include/linux/swapops.h  | 24 ++----------------------
 mm/memory-failure.c      | 10 ++++++++++
 4 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/arch/parisc/kernel/pdt.c b/arch/parisc/kernel/pdt.c
index e391b175f5ec..fdc880e2575a 100644
--- a/arch/parisc/kernel/pdt.c
+++ b/arch/parisc/kernel/pdt.c
@@ -18,8 +18,7 @@
 #include <linux/kthread.h>
 #include <linux/initrd.h>
 #include <linux/pgtable.h>
-#include <linux/swap.h>
-#include <linux/swapops.h>
+#include <linux/mm.h>
 
 #include <asm/pdc.h>
 #include <asm/pdcpat.h>
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e2ac6fff03a8..c667a6c4b657 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3279,12 +3279,17 @@ extern int soft_offline_page(unsigned long pfn, int flags);
 #ifdef CONFIG_MEMORY_FAILURE
 extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
 					bool *migratable_cleared);
+extern void num_poisoned_pages_inc(void);
 #else
 static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
 					bool *migratable_cleared)
 {
 	return 0;
 }
+
+static inline void num_poisoned_pages_inc(void)
+{
+}
 #endif
 
 #ifndef arch_memory_failure
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 86b95ccb81bb..3ba9bf56899d 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -581,8 +581,6 @@ static inline int is_pmd_migration_entry(pmd_t pmd)
 
 #ifdef CONFIG_MEMORY_FAILURE
 
-extern atomic_long_t num_poisoned_pages __read_mostly;
-
 /*
  * Support for hardware poisoned pages
  */
@@ -597,17 +595,7 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
 	return swp_type(entry) == SWP_HWPOISON;
 }
 
-static inline void num_poisoned_pages_inc(void)
-{
-	atomic_long_inc(&num_poisoned_pages);
-}
-
-static inline void num_poisoned_pages_sub(long i)
-{
-	atomic_long_sub(i, &num_poisoned_pages);
-}
-
-#else  /* CONFIG_MEMORY_FAILURE */
+#else
 
 static inline swp_entry_t make_hwpoison_entry(struct page *page)
 {
@@ -618,15 +606,7 @@ static inline int is_hwpoison_entry(swp_entry_t swp)
 {
 	return 0;
 }
-
-static inline void num_poisoned_pages_inc(void)
-{
-}
-
-static inline void num_poisoned_pages_sub(long i)
-{
-}
-#endif  /* CONFIG_MEMORY_FAILURE */
+#endif
 
 static inline int non_swap_entry(swp_entry_t entry)
 {
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 4fff0b36c61d..44d7bf6ff214 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -74,6 +74,16 @@ atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
 static bool hw_memory_failure __read_mostly = false;
 
+inline void num_poisoned_pages_inc(void)
+{
+	atomic_long_inc(&num_poisoned_pages);
+}
+
+static inline void num_poisoned_pages_sub(long i)
+{
+	atomic_long_sub(i, &num_poisoned_pages);
+}
+
 /*
  * Return values:
  *   1:   the page is dissolved (if needed) and taken off from buddy,