[PATCH v6 2/4] mm/hwpoison: move definitions of num_poisoned_pages_* to memory-failure.c

[Naoya Horiguchi <naoya.horiguchi@xxxxxxxxx>]

From: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>

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.

Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
ChangeLog v3 -> v6:
- remove static in definition of num_poisoned_pages_inc() to fix build error.

ChangeLog v2 -> v3:
- added declaration of num_poisoned_pages_inc() in #ifdef CONFIG_MEMORY_FAILURE
---
 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 3264bf993ad8..782ab29bb1fb 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 a91dd08e107b..3e58a812399a 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
  */
@@ -610,17 +608,7 @@ static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
 	return p;
 }
 
-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)
 {
@@ -636,15 +624,7 @@ static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
 {
 	return NULL;
 }
-
-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 d4fef56c0438..323e0a21833f 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,
-- 
2.25.1