x86: lazy-preempt: properly check against preempt-mask
should_resched() should check against preempt_offset after unmasking the
need-resched-bit. Otherwise should_resched() won't work for
preempt_offset != 0 and lazy-preempt set.
Cc: stable-rt@vger.kernel.org
Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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