[PATCH] PCI: Documentation: no more device ids

[linux-2.6] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 13fad5fcdf7996eab9812d5cb781d9157f8cc55e..1963e269314dcabae535545b978f7a544b7e96e5 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -56,13 +56,11 @@
 
 #include <asm/tlbflush.h>
 
-//#define RMAP_DEBUG /* can be enabled only for debugging */
-
-kmem_cache_t *anon_vma_cachep;
+struct kmem_cache *anon_vma_cachep;
 
 static inline void validate_anon_vma(struct vm_area_struct *find_vma)
 {
-#ifdef RMAP_DEBUG
+#ifdef CONFIG_DEBUG_VM
        struct anon_vma *anon_vma = find_vma->anon_vma;
        struct vm_area_struct *vma;
        unsigned int mapcount = 0;
@@ -166,7 +164,8 @@ void anon_vma_unlink(struct vm_area_struct *vma)
                anon_vma_free(anon_vma);
 }
 
-static void anon_vma_ctor(void *data, kmem_cache_t *cachep, unsigned long flags)
+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) {
@@ -206,6 +205,44 @@ out:
        return anon_vma;
 }
 
+#ifdef CONFIG_MIGRATION
+/*
+ * Remove an anonymous page from swap replacing the swap pte's
+ * through real pte's pointing to valid pages and then releasing
+ * the page from the swap cache.
+ *
+ * Must hold page lock on page and mmap_sem of one vma that contains
+ * the page.
+ */
+void remove_from_swap(struct page *page)
+{
+       struct anon_vma *anon_vma;
+       struct vm_area_struct *vma;
+       unsigned long mapping;
+
+       if (!PageSwapCache(page))
+               return;
+
+       mapping = (unsigned long)page->mapping;
+
+       if (!mapping || (mapping & PAGE_MAPPING_ANON) == 0)
+               return;
+
+       /*
+        * We hold the mmap_sem lock. So no need to call page_lock_anon_vma.
+        */
+       anon_vma = (struct anon_vma *) (mapping - PAGE_MAPPING_ANON);
+       spin_lock(&anon_vma->lock);
+
+       list_for_each_entry(vma, &anon_vma->head, anon_vma_node)
+               remove_vma_swap(vma, page);
+
+       spin_unlock(&anon_vma->lock);
+       delete_from_swap_cache(page);
+}
+EXPORT_SYMBOL(remove_from_swap);
+#endif
+
 /*
  * At what user virtual address is page expected in vma?
  */
@@ -499,9 +536,6 @@ void page_add_new_anon_rmap(struct page *page,
  */
 void page_add_file_rmap(struct page *page)
 {
-       BUG_ON(PageAnon(page));
-       BUG_ON(!pfn_valid(page_to_pfn(page)));
-
        if (atomic_inc_and_test(&page->_mapcount))
                __inc_page_state(nr_mapped);
 }
@@ -515,13 +549,14 @@ void page_add_file_rmap(struct page *page)
 void page_remove_rmap(struct page *page)
 {
        if (atomic_add_negative(-1, &page->_mapcount)) {
-               if (page_mapcount(page) < 0) {
+#ifdef CONFIG_DEBUG_VM
+               if (unlikely(page_mapcount(page) < 0)) {
                        printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page));
                        printk (KERN_EMERG "  page->flags = %lx\n", page->flags);
                        printk (KERN_EMERG "  page->count = %x\n", page_count(page));
                        printk (KERN_EMERG "  page->mapping = %p\n", page->mapping);
                }
-
+#endif
                BUG_ON(page_mapcount(page) < 0);
                /*
                 * It would be tidy to reset the PageAnon mapping here,