compiler: introduce __used and __maybe_unused

[powerpc.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 669acb2..304f519 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -162,8 +162,7 @@ void anon_vma_unlink(struct vm_area_struct *vma)
 static void anon_vma_ctor(void *data, struct kmem_cache *cachep,
                          unsigned long flags)
 {
-       if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-                                               SLAB_CTOR_CONSTRUCTOR) {
+       if (flags & SLAB_CTOR_CONSTRUCTOR) {
                struct anon_vma *anon_vma = data;
 
                spin_lock_init(&anon_vma->lock);
@@ -183,7 +182,7 @@ void __init anon_vma_init(void)
  */
 static struct anon_vma *page_lock_anon_vma(struct page *page)
 {
-       struct anon_vma *anon_vma = NULL;
+       struct anon_vma *anon_vma;
        unsigned long anon_mapping;
 
        rcu_read_lock();
@@ -195,9 +194,16 @@ static struct anon_vma *page_lock_anon_vma(struct page *page)
 
        anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
        spin_lock(&anon_vma->lock);
+       return anon_vma;
 out:
        rcu_read_unlock();
-       return anon_vma;
+       return NULL;
+}
+
+static void page_unlock_anon_vma(struct anon_vma *anon_vma)
+{
+       spin_unlock(&anon_vma->lock);
+       rcu_read_unlock();
 }
 
 /*
@@ -333,7 +339,8 @@ static int page_referenced_anon(struct page *page)
                if (!mapcount)
                        break;
        }
-       spin_unlock(&anon_vma->lock);
+
+       page_unlock_anon_vma(anon_vma);
        return referenced;
 }
 
@@ -490,12 +497,15 @@ int page_mkclean(struct page *page)
                struct address_space *mapping = page_mapping(page);
                if (mapping)
                        ret = page_mkclean_file(mapping, page);
+               if (page_test_dirty(page)) {
+                       page_clear_dirty(page);
+                       ret = 1;
+               }
        }
-       if (page_test_and_clear_dirty(page))
-               ret = 1;
 
        return ret;
 }
+EXPORT_SYMBOL_GPL(page_mkclean);
 
 /**
  * page_set_anon_rmap - setup new anonymous rmap
@@ -597,8 +607,10 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
                 * Leaving it set also helps swapoff to reinstate ptes
                 * faster for those pages still in swapcache.
                 */
-               if (page_test_and_clear_dirty(page))
+               if (page_test_dirty(page)) {
+                       page_clear_dirty(page);
                        set_page_dirty(page);
+               }
                __dec_zone_page_state(page,
                                PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
        }
@@ -802,7 +814,8 @@ static int try_to_unmap_anon(struct page *page, int migration)
                if (ret == SWAP_FAIL || !page_mapped(page))
                        break;
        }
-       spin_unlock(&anon_vma->lock);
+
+       page_unlock_anon_vma(anon_vma);
        return ret;
 }