mm/memory-failure: use helper macro task_pid_nr()

Use helper macro task_pid_nr() to get the pid of a task.  No functional
change intended.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Miaohe Lin <[email protected]>
Cc: Borislav Petkov (AMD) <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: kernel test robot <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/memory-failure.c

@@ -343,7 +343,7 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
 	int ret = 0;
 
 	pr_err("%#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n",
-			pfn, t->comm, t->pid);
+			pfn, t->comm, task_pid_nr(t));
 
 	if ((flags & MF_ACTION_REQUIRED) && (t == current))
 		ret = force_sig_mceerr(BUS_MCEERR_AR,
@@ -361,7 +361,7 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
 				      addr_lsb, t);
 	if (ret < 0)
 		pr_info("Error sending signal to %s:%d: %d\n",
-			t->comm, t->pid, ret);
+			t->comm, task_pid_nr(t), ret);
 	return ret;
 }
 
@@ -523,7 +523,7 @@ static void kill_procs(struct list_head *to_kill, int forcekill,
 		if (forcekill) {
 			if (tk->addr == -EFAULT) {
 				pr_err("%#lx: forcibly killing %s:%d because of failure to unmap corrupted page\n",
-				       pfn, tk->tsk->comm, tk->tsk->pid);
+				       pfn, tk->tsk->comm, task_pid_nr(tk->tsk));
 				do_send_sig_info(SIGKILL, SEND_SIG_PRIV,
 						 tk->tsk, PIDTYPE_PID);
 			}
@@ -536,7 +536,7 @@ static void kill_procs(struct list_head *to_kill, int forcekill,
 			 */
 			else if (kill_proc(tk, pfn, flags) < 0)
 				pr_err("%#lx: Cannot send advisory machine check signal to %s:%d\n",
-				       pfn, tk->tsk->comm, tk->tsk->pid);
+				       pfn, tk->tsk->comm, task_pid_nr(tk->tsk));
 		}
 		list_del(&tk->nd);
 		put_task_struct(tk->tsk);