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Subject[PATCH 08/10] posix-cpu-timers: check_thread_timers() uses task_sched_runtime()
Date
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

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@trillion01.com>
CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
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 c69b8d8..4043282 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -958,7 +958,8 @@ 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


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