On Wed, 23 Dec 2020 10:48:10 +0100 Helge Deller <del...@gmx.de> wrote:
> > static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, > > struct pid *pid, struct task_struct *task) > > { > > - unsigned long wchan; > > - > > if (ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) > > - wchan = get_wchan(task); > > - else > > - wchan = 0; > > - > > - if (wchan) > > - seq_printf(m, "%ps", (void *) wchan); > > + seq_printf(m, "%ps", (void *)get_wchan(task)); > > else > > seq_putc(m, '0'); > > get_wchan() does return NULL sometimes, in which case with > your change now "0x0" instead of "0" gets printed. Ah, OK, ignore ;)