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Date: Mon, 28 Sep 2009 18:16:44 +0800 From: Barry Song <21cnbao@...il.com> To: akpm@...ux-foundation.org, davem@...emloft.net, patrick.ohly@...el.com CC: uclinux-dist-devel@...ckfin.uclinux.org, linux-kernel@...r.kernel.org, Barry Song <21cnbao@...il.com> Subject: [PATCH] Fix half-Y2K38 problem in timecompare_update while calculating offset ktime will overflow from 03:14:07 UTC on Tuesday, 19 January 2038, ktime_add() in timecompare_update() will overflow a half earlier. As a result, wrong offset will be gotten, then cause some strange problems. --- kernel/time/timecompare.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/time/timecompare.c b/kernel/time/timecompare.c index 71e7f1a..d2d893e 100644 --- a/kernel/time/timecompare.c +++ b/kernel/time/timecompare.c @@ -89,7 +89,7 @@ int timecompare_offset(struct timecompare *sync, * source time */ sample.offset = - ktime_to_ns(ktime_add(end, start)) / 2 - + (ktime_to_ns(end) + ktime_to_ns(start)) / 2 - ts; /* simple insertion sort based on duration */ -- 1.5.6.3 -- 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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