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timecompare: 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.

Signed-off-by: Barry Song <21cnbao@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Patrick Ohly <patrick.ohly@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Barry Song 2009-12-15 16:45:34 -08:00 committed by Linus Torvalds
parent 4365a5676f
commit f065f41f48
1 changed files with 1 additions and 1 deletions
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2
kernel/time/timecompare.c
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@ -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 */