* Note that the fown_struct, @fown, is never outside the context of a
* struct file, so the file structure (and associated security information)
* can always be obtained:
- * (struct file *)((long)fown - offsetof(struct file,f_owner));
+ * container_of(fown, struct file, f_owner)
* @tsk contains the structure of task receiving signal.
* @fown contains the file owner information.
* @sig is the signal that will be sent. When 0, kernel sends SIGIO.