s390/stp: Remove udelay from stp_sync_clock()
[ Upstream commit b367017cdac21781a74eff4e208d3d38e1f38d3f ] When an stp sync check is handled on a system with multiple cpus each cpu gets a machine check but only the first one actually handles the sync operation. All other CPUs spin waiting for the first one to finish with a short udelay(). But udelay can't be used here as the first CPU modifies tod_clock_base before performing the sync op. During this timeframe get_tod_clock_monotonic() might return a non-monotonic time. The time spent waiting should be very short and udelay is a busy loop anyways, therefore simply remove the udelay. Reviewed-by:Heiko Carstens <hca@linux.ibm.com> Signed-off-by:
Sven Schnelle <svens@linux.ibm.com> Signed-off-by:
Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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