The patch titled
timecompare: fix half-Y2K38 problem in timecompare_update while calculating offset
has been added to the -mm tree. Its filename is
timecompare-fix-half-y2k38-problem-in-timecompare_update-while-calculating-offset.patch
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------------------------------------------------------
Subject: timecompare: fix half-Y2K38 problem in timecompare_update while calculating offset
From: Barry Song <21cnbao@xxxxxxxxx>
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.
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Patrick Ohly <patrick.ohly@xxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: John Stultz <johnstul@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/time/timecompare.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/time/timecompare.c~timecompare-fix-half-y2k38-problem-in-timecompare_update-while-calculating-offset kernel/time/timecompare.c
--- a/kernel/time/timecompare.c~timecompare-fix-half-y2k38-problem-in-timecompare_update-while-calculating-offset
+++ a/kernel/time/timecompare.c
@@ -89,7 +89,7 @@ int timecompare_offset(struct timecompar
* 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 */
_
Patches currently in -mm which might be from 21cnbao@xxxxxxxxx are
timecompare-fix-half-y2k38-problem-in-timecompare_update-while-calculating-offset.patch
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