Changeset 01029fc in mainline for kernel/generic/src/mm/as.c

Timestamp:

2012-11-07T21:30:44Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3b8a990

Parents:

c387838

Message:

Define two new as area backend callbacks.

• Add is_resizable(as_area_t *)
• Add is_shareable(as_area_t *)
• Remove special knowledge of the phys backend from as_area_resize()

File:

• kernel/generic/src/mm/as.c (modified) (2 diffs)

kernel/generic/src/mm/as.c

@@ -696 +696 @@
                 return ENOENT;
         }
-        
-        if (area->backend == &phys_backend) {
-                /*
-                 * Remapping of address space areas associated
-                 * with memory mapped devices is not supported.
+
+        if (!area->backend->is_resizable(area)) {
+                /*
+                 * The backend does not support resizing for this area.
                  */
                 mutex_unlock(&area->lock);
@@ -1057 +1056 @@
         }
         
-        if ((!src_area->backend) || (!src_area->backend->share)) {
-                /*
-                 * There is no backend or the backend does not
-                 * know how to share the area.
+        if (!src_area->backend->is_shareable(src_area)) {
+                /*
+                 * The backend does not permit sharing of this area.
                  */
                 mutex_unlock(&src_area->lock);