[BUGFIX PATCH 3/2] posix-cpu-timers: check_thread_timers() uses task_sched_runtime()

From: KOSAKI Motohiro
Date: Mon Apr 29 2013 - 15:17:54 EST


A type of tsk->se.sum_exec_runtime is u64. Thus reading it is racy when
running 32bit. We should use task_sched_runtime().

Cc: Olivier Langlois <olivier@xxxxxxxxxxxxxx>
CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
---
kernel/posix-cpu-timers.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index dc61bc3..651b6c7 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -944,7 +944,8 @@ static void check_thread_timers(struct task_struct *tsk,
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
- if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
+ unsigned long long runtime = task_sched_runtime(tsk, false);
+ if (!--maxfire || runtime < t->expires.sched) {
tsk->cputime_expires.sched_exp = t->expires.sched;
break;
}
--
1.7.1


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/