From: Heiko Carstens <hca@xxxxxxxxxxxxx> commit 72bbc226ed2ef0a46c165a482861fff00dd6d4e1 upstream. When converting the vdso assembler code to C it was forgotten to actually copy the tod_steering_delta value to vdso_data page. Which in turn means that tod clock steering will not work correctly. Fix this by simply copying the value whenever it is updated. Fixes: 4bff8cb54502 ("s390: convert to GENERIC_VDSO") Cc: <stable@xxxxxxxxxxxxxxx> # 5.10 Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/s390/kernel/time.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -398,6 +398,7 @@ static void clock_sync_global(unsigned l tod_steering_delta); tod_steering_end = now + (abs(tod_steering_delta) << 15); vdso_data->arch_data.tod_steering_end = tod_steering_end; + vdso_data->arch_data.tod_steering_delta = tod_steering_delta; /* Update LPAR offset. */ if (ptff_query(PTFF_QTO) && ptff(&qto, sizeof(qto), PTFF_QTO) == 0)