linux-kernel - [PATCH] Assign task_struct.exit_code before taskstats

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Message-Id: <200708211901.l7LJ1Dg2372490@sabah.engr.sgi.com>
Date:	Tue, 21 Aug 2007 12:01:13 -0700 (PDT)
From:	Jonathan Lim <jlim@....com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Assign task_struct.exit_code before taskstats_exit()

taskstats.ac_exitcode is assigned to task_struct.exit_code in bacct_add_tsk()
through the following kernel function calls: 

  do_exit()
    taskstats_exit()
      fill_pid()
        bacct_add_tsk()

The problem is that in do_exit(), task_struct.exit_code is set to 'code' only
after taskstats_exit() has been called.  So we need to move the assignment
before taskstats_exit().

Diff'd against: linux/kernel/git/stable/linux-2.6.22.y.git

Signed-off-by: Jonathan Lim <jlim@....com>

--- a/kernel/exit.c	2007-08-20 16:37:55.000000000 -0700
+++ b/kernel/exit.c	2007-08-21 11:00:56.000000000 -0700
@@ -941,6 +941,7 @@ fastcall NORET_TYPE void do_exit(long co
 	if (unlikely(tsk->audit_context))
 		audit_free(tsk);
 
+	tsk->exit_code = code;
 	taskstats_exit(tsk, group_dead);
 
 	exit_mm(tsk);
@@ -961,7 +962,6 @@ fastcall NORET_TYPE void do_exit(long co
 	if (tsk->binfmt)
 		module_put(tsk->binfmt->module);
 
-	tsk->exit_code = code;
 	proc_exit_connector(tsk);
 	exit_task_namespaces(tsk);
 	exit_notify(tsk);
-
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