Ticket #6245: offsetof.patch

src/system/kernel/fs/rootfs.cpp

@@ -377 +377 @@
     rw_lock_init(&fs->lock, "rootfs");
 
     fs->vnode_list_hash = hash_init(ROOTFS_HASH_SIZE,
-        (addr_t)&vnode->all_next - (addr_t)vnode, &rootfs_vnode_compare_func,
+        offsetof(struct rootfs_vnode, all_next), &rootfs_vnode_compare_func,
         &rootfs_vnode_hash_func);
     if (fs->vnode_list_hash == NULL) {
         err = B_NO_MEMORY;