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Date: Mon, 16 Sep 2013 15:43:49 -0700 From: Kevin Hilman <khilman@...aro.org> To: Frederic Weisbecker <fweisbec@...il.com> Cc: linux-arm-kernel@...ts.infradead.org, linaro-kernel@...ts.linaro.org, Paul McKenney <paulmck@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org Subject: [PATCH 2/2] sched/nohz: fix overflow error in scheduler_tick_max_deferment() The conversion of the max deferment from usecs to nsecs can easily overflow on platforms where a long is 32-bits. To fix, cast the usecs value to u64 before multiplying by NSECS_PER_USEC. This was discovered on 32-bit ARM platform when extending the max deferment value. Cc: Frederic Weisbecker <fweisbec@...il.com> Signed-off-by: Kevin Hilman <khilman@...aro.org> --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 4b1fe3e..3d7c80e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2203,7 +2203,7 @@ u64 scheduler_tick_max_deferment(void) if (time_before_eq(next, now)) return 0; - return jiffies_to_usecs(next - now) * NSEC_PER_USEC; + return (u64)jiffies_to_usecs(next - now) * NSEC_PER_USEC; } static __init int sched_nohz_full_init_debug(void) -- 1.8.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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