Merge tag 'iio-fixes-4.19a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...

[linux-2.6-block.git] / mm / ksm.c

diff --git a/mm/ksm.c b/mm/ksm.c
index 2621be57bd957caabd5df559d41f2c40e284a26d..5b0894b45ee57257f34bde6072ae63a26c1714e6 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -652,9 +652,9 @@ static void remove_node_from_stable_tree(struct stable_node *stable_node)
         * list_head to stay clear from the rb_parent_color union
         * (aligned and different than any node) and also different
         * from &migrate_nodes. This will verify that future list.h changes
-        * don't break STABLE_NODE_DUP_HEAD.
+        * don't break STABLE_NODE_DUP_HEAD. Only recent gcc can handle it.
         */
-#if GCC_VERSION >= 40903 /* only recent gcc can handle it */
+#if defined(GCC_VERSION) && GCC_VERSION >= 40903
        BUILD_BUG_ON(STABLE_NODE_DUP_HEAD <= &migrate_nodes);
        BUILD_BUG_ON(STABLE_NODE_DUP_HEAD >= &migrate_nodes + 1);
 #endif
@@ -703,7 +703,7 @@ again:
         * We cannot do anything with the page while its refcount is 0.
         * Usually 0 means free, or tail of a higher-order page: in which
         * case this node is no longer referenced, and should be freed;
-        * however, it might mean that the page is under page_freeze_refs().
+        * however, it might mean that the page is under page_ref_freeze().
         * The __remove_mapping() case is easy, again the node is now stale;
         * but if page is swapcache in migrate_page_move_mapping(), it might
         * still be our page, in which case it's essential to keep the node.
@@ -714,7 +714,7 @@ again:
                 * work here too.  We have chosen the !PageSwapCache test to
                 * optimize the common case, when the page is or is about to
                 * be freed: PageSwapCache is cleared (under spin_lock_irq)
-                * in the freeze_refs section of __remove_mapping(); but Anon
+                * in the ref_freeze section of __remove_mapping(); but Anon
                 * page->mapping reset to NULL later, in free_pages_prepare().
                 */
                if (!PageSwapCache(page))