[PATCH 03/16] kdb: Use real_parent when displaying a list of processes

[Eric W. Biederman]

kdb has a bug that when using the ps command to display a list of
processes, if a process is being debugged the debugger as the parent
process.

This is silly, and I expect it never comes up in ptractice.  As there
is very little point in using gdb and kdb simultaneously.  Update the
code to use real_parent so that it is clear kdb does not want to
display a debugger as the parent of a process.

Cc: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Cc: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Fixes: 5d5314d6795f ("kdb: core for kgdb back end (1 of 2)"
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
 kernel/debug/kdb/kdb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 0852a537dad4..db49f1026eaa 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2306,7 +2306,7 @@ void kdb_ps1(const struct task_struct *p)
 
 	cpu = kdb_process_cpu(p);
 	kdb_printf("0x%px %8d %8d  %d %4d   %c  0x%px %c%s\n",
-		   (void *)p, p->pid, p->parent->pid,
+		   (void *)p, p->pid, p->real_parent->pid,
 		   kdb_task_has_cpu(p), kdb_process_cpu(p),
 		   kdb_task_state_char(p),
 		   (void *)(&p->thread),
-- 
2.35.3