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s390/time: select CLOCKSOURCE_VALIDATE_LAST_CYCLE

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The value returned by read_tod_clock() will overflow on September 17th 2042.
To avoid that system time jumps back select CLOCKSOURCE_VALIDATE_LAST_CYCLE
which enables a sanity check in order to prevent negative "delta" values.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-07-20 14:16:03 +02:00
parent 58e15716fe
commit 555701a714
1 changed files with 1 additions and 0 deletions
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arch/s390/Kconfig
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@ -125,6 +125,7 @@ config S390
select HAVE_ARCH_JUMP_LABEL_RELATIVE
select HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_VMALLOC
select CLOCKSOURCE_VALIDATE_LAST_CYCLE
select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_SOFT_DIRTY