[PATCH] taskstats: set version field for tgid exit

[Xidorn Quan]

Currently, an aggregated taskstats struct for task group exit does not
have its version field set. This patch fixes it.

Signed-off-by: Xidorn Quan <m...@upsuper.org>
---
Users of taskstats may expect that version of the struct is always set
up properly, so that they can check whether it's supported.
---
 kernel/taskstats.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index e2ac0e37c4ae..c646b27f18ac 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -258,18 +258,21 @@ static int fill_stats_for_tgid(pid_t tgid, struct 
taskstats *stats)
 static void fill_tgid_exit(struct task_struct *tsk)
 {
        unsigned long flags;
+       struct taskstats *stats;
 
        spin_lock_irqsave(&tsk->sighand->siglock, flags);
-       if (!tsk->signal->stats)
+       stats = tsk->signal->stats;
+       if (!stats)
                goto ret;
 
        /*
         * Each accounting subsystem calls its functions here to
         * accumalate its per-task stats for tsk, into the per-tgid structure
         *
-        *      per-task-foo(tsk->signal->stats, tsk);
+        *      per-task-foo(stats, tsk);
         */
-       delayacct_add_tsk(tsk->signal->stats, tsk);
+       delayacct_add_tsk(stats, tsk);
+       stats->version = TASKSTATS_VERSION;
 ret:
        spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
        return;
-- 
2.25.1