mm/hwpoison: introduce num_poisoned_pages wrappers
num_poisoned_pages counter will be changed outside mm/memory-failure.c
by a subsequent patch, so this patch prepares wrappers to manipulate it.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Tested-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index cedf3d3..ec04669 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -164,6 +164,9 @@
#endif
#ifdef CONFIG_MEMORY_FAILURE
+
+extern atomic_long_t num_poisoned_pages __read_mostly;
+
/*
* Support for hardware poisoned pages
*/
@@ -177,6 +180,26 @@
{
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_dec(void)
+{
+ atomic_long_dec(&num_poisoned_pages);
+}
+
+static inline void num_poisoned_pages_add(long num)
+{
+ atomic_long_add(num, &num_poisoned_pages);
+}
+
+static inline void num_poisoned_pages_sub(long num)
+{
+ atomic_long_sub(num, &num_poisoned_pages);
+}
#else
static inline swp_entry_t make_hwpoison_entry(struct page *page)