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Subjectpreempt.h: some SOFTIRQ_OFFSET should be SOFTIRQ_MASK?
SOFTIRQ is a counter.
Why here:

#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
#define in_task() (!(preempt_count() & \
(NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET)))

we check only lowest bit?

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