SOFTIRQ_DISABLE_OFFSET
DEFINE(SOFTIRQ_DISABLE_OFFSET,SOFTIRQ_DISABLE_OFFSET);
__local_bh_disable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
__local_bh_enable_ip(ip, SOFTIRQ_DISABLE_OFFSET);
__local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
#define SOFTIRQ_LOCK_OFFSET (SOFTIRQ_DISABLE_OFFSET + PREEMPT_LOCK_OFFSET)
__local_bh_enable(SOFTIRQ_DISABLE_OFFSET);
if (softirq_count() == SOFTIRQ_DISABLE_OFFSET)