Merge branch 'linus' into core/printk

[sfrench/cifs-2.6.git] / include / linux / mm_types.h

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 9cfc9b627fdd745d4702a903e29db36f2676aa34..d84feb7bdbf00b8fa054364c7fa2d80d2a20b2a6 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -96,6 +96,23 @@ struct page {
 #endif /* WANT_PAGE_VIRTUAL */
 };
 
+/*
+ * A region containing a mapping of a non-memory backed file under NOMMU
+ * conditions.  These are held in a global tree and are pinned by the VMAs that
+ * map parts of them.
+ */
+struct vm_region {
+       struct rb_node  vm_rb;          /* link in global region tree */
+       unsigned long   vm_flags;       /* VMA vm_flags */
+       unsigned long   vm_start;       /* start address of region */
+       unsigned long   vm_end;         /* region initialised to here */
+       unsigned long   vm_top;         /* region allocated to here */
+       unsigned long   vm_pgoff;       /* the offset in vm_file corresponding to vm_start */
+       struct file     *vm_file;       /* the backing file or NULL */
+
+       atomic_t        vm_usage;       /* region usage count */
+};
+
 /*
  * This struct defines a memory VMM memory area. There is one of these
  * per VM-area/task.  A VM area is any part of the process virtual memory
@@ -152,7 +169,7 @@ struct vm_area_struct {
        unsigned long vm_truncate_count;/* truncate_count or restart_addr */
 
 #ifndef CONFIG_MMU
-       atomic_t vm_usage;              /* refcount (VMAs shared if !MMU) */
+       struct vm_region *vm_region;    /* NOMMU mapping region */
 #endif
 #ifdef CONFIG_NUMA
        struct mempolicy *vm_policy;    /* NUMA policy for the VMA */
@@ -259,4 +276,7 @@ struct mm_struct {
 #endif
 };
 
+/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
+#define mm_cpumask(mm) (&(mm)->cpu_vm_mask)
+
 #endif /* _LINUX_MM_TYPES_H */