[PATCH] export install_page() to modules

install_page() is a library function which we expect will be used by all
drivers which implement vm_operations.populate().  Therefore it should be
exported to kernel modules.

Petr Vandrovec has a project which involves sparse mappings of device memory
which can use remap_file_pages().  It needs install_page().

kernel/ksyms.c

@@ -196,6 +196,7 @@ EXPORT_SYMBOL(__invalidate_device);
 EXPORT_SYMBOL(invalidate_inode_pages);
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
 EXPORT_SYMBOL(truncate_inode_pages);
+EXPORT_SYMBOL(install_page);
 EXPORT_SYMBOL(fsync_bdev);
 EXPORT_SYMBOL(permission);
 EXPORT_SYMBOL(vfs_permission);