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From:   "Eric W. Biederman" <ebiederm@xmission.com>
To:     linux-kernel@vger.kernel.org
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        Michael Ellerman <mpe@ellerman.id.au>,
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        Paul Mackerras <paulus@samba.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>
Date:   Wed, 18 May 2022 17:53:43 -0500
Message-Id: <20220518225355.784371-4-ebiederm@xmission.com>
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Subject: [PATCH 04/16] powerpc/xmon:  Use real_parent when displaying a list of processes
Precedence: bulk

xmon has a bug (copied from kdb) that when showing a list of processes
the debugger is listed as the parent, if a processes is being debugged.

This is silly, and I expect it is rare enough no has noticed in
practice.  Update the code to use real_parent so that it is clear xmon
does not want to display a debugger as the parent of a process.

Cc: Douglas Miller <dougmill@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Fixes: 6dfb54049f9a ("powerpc/xmon: Add xmon command to dump process/task similar to ps(1)")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
 arch/powerpc/xmon/xmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index fd72753e8ad5..b308ef9ce604 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3282,7 +3282,7 @@ static void show_task(struct task_struct *volatile tsk)
 
 	printf("%16px %16lx %16px %6d %6d %c %2d %s\n", tsk,
 		tsk->thread.ksp, tsk->thread.regs,
-		tsk->pid, rcu_dereference(tsk->parent)->pid,
+		tsk->pid, rcu_dereference(tsk->real_parent)->pid,
 		state, task_cpu(tsk),
 		tsk->comm);
 }
-- 
2.35.3