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s390/vdso: copy tod_steering_delta value to vdso_data page

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commit 72bbc226ed 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: 4bff8cb545 ("s390: convert to GENERIC_VDSO")
Cc: <stable@vger.kernel.org> # 5.10
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Carstens
2021-03-23 21:40:11 +01:00
committed by Greg Kroah-Hartman
parent f706acc931
commit b332265430
1 changed files with 1 additions and 0 deletions
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arch/s390/kernel/time.c
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@@ -398,6 +398,7 @@ static void clock_sync_global(unsigned long long delta)
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)