3 files changed, 7 insertions, 22 deletions

diff --git a/include/linux/list.h b/include/linux/list.h
index 30cf4200ab40..5356f4d661a7 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -113,17 +113,6 @@ extern void __list_del_entry(struct list_head *entry);
 extern void list_del(struct list_head *entry);
 #endif
 
-#ifdef CONFIG_DEBUG_LIST
-/*
- * See devm_memremap_pages() which wants DEBUG_LIST=y to assert if one
- * of the pages it allocates is ever passed to list_add()
- */
-extern void list_force_poison(struct list_head *entry);
-#else
-/* fallback to the less strict LIST_POISON* definitions */
-#define list_force_poison list_del
-#endif
-
 /**
  * list_replace - replace old entry by new one
  * @old : the element to be replaced
diff --git a/kernel/memremap.c b/kernel/memremap.c
index b981a7b023f0..778191e3e887 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -351,8 +351,13 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
         for_each_device_pfn(pfn, page_map) {
                 struct page *page = pfn_to_page(pfn);
 
-                /* ZONE_DEVICE pages must never appear on a slab lru */
-                list_force_poison(&page->lru);
+                /*
+                 * ZONE_DEVICE pages union ->lru with a ->pgmap back
+                 * pointer.  It is a bug if a ZONE_DEVICE page is ever
+                 * freed or placed on a driver-private list.  Seed the
+                 * storage with LIST_POISON* values.
+                 */
+                list_del(&page->lru);
                 page->pgmap = pgmap;
         }
         devres_add(dev, page_map);
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 3345a089ef7b..3859bf63561c 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -12,13 +12,6 @@
 #include <linux/kernel.h>
 #include <linux/rculist.h>
 
-static struct list_head force_poison;
-void list_force_poison(struct list_head *entry)
-{
-        entry->next = &force_poison;
-        entry->prev = &force_poison;
-}
-
 /*
  * Insert a new entry between two known consecutive entries.
  *
@@ -30,8 +23,6 @@ void __list_add(struct list_head *new,
                               struct list_head *prev,
                               struct list_head *next)
 {
-        WARN(new->next == &force_poison || new->prev == &force_poison,
-                "list_add attempted on force-poisoned entry\n");
         WARN(next->prev != prev,
                 "list_add corruption. next->prev should be "
                 "prev (%p), but was %p. (next=%p).\n",