3  *	linux/kernel/softirq.c
39    - If a softirq needs serialization, let it serialize itself
41    - Even if softirq is serialized, only local cpu is marked for
47    - NET RX softirq. It is multithreaded and does not require
49    - NET TX softirq. It kicks software netdevice queues, hence
73  * the softirq load for us.
97  * - count is changed by SOFTIRQ_OFFSET on entering or leaving softirq
104  * softirq and whether we just have bh disabled.
111  * softirq disabled section to be preempted.
118  * the task which is in a softirq disabled section is preempted or blocks.
132  * Returns false if the per CPU softirq::cnt is 0 otherwise true.
135  * softirq pending warnings, which would happen when the task which holds
163 	 * Track the per CPU softirq disabled state. On RT this is per CPU  in __local_bh_disable_ip()
230 	 * softirq daemon.  in __local_bh_enable_ip()
238 	 * Adjust softirq count to SOFTIRQ_OFFSET which makes  in __local_bh_enable_ip()
306  * This one is for softirq.c-internal use, where hardirqs are disabled
380 	 * softirq processing:  in __local_bh_enable_ip()
386 		 * Run softirq if any pending. And do it in its own stack  in __local_bh_enable_ip()
431 		 * We can safely execute softirq on the current stack if  in invoke_softirq()
439 		 * be potentially deep already. So call softirq in its own stack  in invoke_softirq()
470  * We restart softirq processing for at most MAX_SOFTIRQ_RESTART times,
530 	 * softirq. A softirq handled, such as network RX, might set PF_MEMALLOC  in handle_softirqs()
564 			pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",  in handle_softirqs()
704 	 * If we're in an interrupt or softirq, we're done  in raise_softirq_irqoff()
705 	 * (this also catches softirq-disabled code). We will  in raise_softirq_irqoff()
706 	 * actually run the softirq once we return from  in raise_softirq_irqoff()
707 	 * the irq or softirq.  in raise_softirq_irqoff()
710 	 * schedule the softirq soon.  in raise_softirq_irqoff()
947 		 * We can safely run softirq on inline stack, as we are not deep  in run_ksoftirqd()
1041 	cpuhp_setup_state_nocalls(CPUHP_SOFTIRQ_DEAD, "softirq:dead", NULL,  in spawn_ksoftirqd()