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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux into akpm

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Pull s390 regression fix from Martin Schwidefsky:
 "The recent fix for the s390 sched_clock() function uncovered yet
  another bug in s390_next_ktime which causes an endless loop in KVM.
  This regression should be fixed before v3.8.

  I keep the fingers crossed that this is the last one for v3.8."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/timer: avoid overflow when programming clock comparator
This commit is contained in:
Linus Torvalds 2013-02-12 16:16:29 -08:00
commit a0e5056e3b
1 changed files with 3 additions and 0 deletions
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arch/s390/kernel/time.c
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@ -120,6 +120,9 @@ static int s390_next_ktime(ktime_t expires,
nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
do_div(nsecs, 125);
S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
/* Program the maximum value if we have an overflow (== year 2042) */
if (unlikely(S390_lowcore.clock_comparator < sched_clock_base_cc))
S390_lowcore.clock_comparator = -1ULL;
set_clock_comparator(S390_lowcore.clock_comparator);
return 0;
}