void__rcu_irq_enter_check_tick(void); #else staticinlinevoid__rcu_irq_enter_check_tick(void) { } #endif staticinlinevoidrcu_nmi_exit(void) static__always_inlinevoidrcu_irq_enter_check_tick(void) { if(context_tracking_enabled())
trace_ipi_entry_rcuidle(ipi_types[ipinr]); //单检索只有这里一个 trace_ipi_entry trece event switch (ipinr) { ... case IPI_CALL_FUNC: generic_smp_call_function_interrupt(); break; ... case IPI_IRQ_WORK: irq_work_run(); break; ... } if ((unsigned)ipinr < NR_IPI) trace_ipi...
void irq_exit(void){account_system_vtime(current);trace_hardirq_exit();sub_preempt_count(IRQ_EXIT_OFFSET);if (!in_interrupt() && local_softirq_pending())invoke_softirq();rcu_irq_exit();#ifdef CONFIG_NO_HZ/* Make sure that timer wheel updates are propagated */if (idle_cpu(smp_proces...
/* Make sure that timer wheel updates are propagated */ rcu_irq_exit(); if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched()) tick_nohz_stop_sched_tick(0); #endif preempt_enable_no_resched(); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14....
irq_enter()函数的核心调用是__irq_enter(),后者的主要作用是在图2的 preempt_count变量的HARDIRQ部分+1,即标识一个hardirq的上下文,所以可以认为do_IRQ()调用irq_enter函数意味着中断处理进入hardirq阶段。此时处理器响应外部中断的能力依然是被disable掉的(EFLAG.IF=0),因为ISR基本上属于设备驱动程序涉足的领域...
irq_enter /** Enter an interrupt context.*/void irq_enter(void){ rcu_irq_enter(); if (is_idle_task(current) && !in_interrupt()) { /* * Prevent raise_softirq from needlessl... kernel 原创 sunlei0625 2023-06-05 13:48:10 46阅读 python 中断IRQ # Python中断IRQ 在嵌入式系统...
rcu_bh_qsctr_inc(cpu); } h++; pending >>= 1; } while (pending); ... } 从上面看到,从softirq_vec[]中取项是由pending右移位计算的。 另外,在激活软中断的操作中: #define __raise_softirq_irqoff(nr) do { local_softirq_pending() |= 1UL << (nr); } while (0) 可以看到...
irq_enter()和irq_exit()函数分别用于标记ISR的进入和退出,具体的标记方法请参考介绍preempt_count()的这篇文章。 而generic_handle_irq()函数,实际就是回调IRQ之前安装的第一级处理函数(desc->handle_irq)。 void generic_handle_irq_desc(struct irq_desc *desc) { //执行第一级处理函数 desc->handle_irq...
6 @@ void irqentry_enter_from_user_mode(struct pt_regs *regs); */ void irqentry_exit_to_user_mode(struct pt_regs *regs); -#ifndef irqentry_state -/** - * struct irqentry_state - Opaque object for exception state storage - * @exit_rcu: Used exclusively in the irqentry_*() ...
6 @@ void irqentry_enter_from_user_mode(struct pt_regs *regs); > */ > void irqentry_exit_to_user_mode(struct pt_regs *regs); > > -#ifndef irqentry_state > -/** > - * struct irqentry_state - Opaque object for exception state storage > - * @exit_rcu: Used exclusively in ...