[PATCH 1/2] mm: set task exit code before complete_vfork_done()

[Konstantin Khlebnikov]

kthread_stop() uses task->vfork_done for synchronization. The exiting kthread
shouldn't do complete_vfork_done() until it sets ->exit_code.

fix for mm-correctly-synchronize-rss-counters-at-exit-exec.patch

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
---
 kernel/exit.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index eb12719..70875a6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -960,6 +960,9 @@ void do_exit(long code)
 
 	acct_update_integrals(tsk);
 
+	/* Set exit_code before complete_vfork_done() in mm_release() */
+	tsk->exit_code = code;
+
 	/* Release mm and sync mm's RSS info before statistics gathering */
 	mm_release(tsk, tsk->mm);
 
@@ -975,7 +978,6 @@ void do_exit(long code)
 		tty_audit_exit();
 	audit_free(tsk);
 
-	tsk->exit_code = code;
 	taskstats_exit(tsk, group_dead);
 
 	exit_mm(tsk);

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