1 files changed, 21 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 1d117190c350..e7a13e90bd05 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2392,3 +2392,24 @@ retry:
 
 	return ret;
 }
+
+void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
+{
+	int i;
+
+	/*
+	 * A further optimization is to have per section refcounted
+	 * num_poisoned_pages.  But that would need more space per memmap, so
+	 * for now just do a quick global check to speed up this routine in the
+	 * absence of bad pages.
+	 */
+	if (atomic_long_read(&num_poisoned_pages) == 0)
+		return;
+
+	for (i = 0; i < nr_pages; i++) {
+		if (PageHWPoison(&memmap[i])) {
+			num_poisoned_pages_dec();
+			ClearPageHWPoison(&memmap[i]);
+		}
+	}
+}