给模块传递参数，使得这个模块的扩展和应用有了空间。例如，在我的机器上查看/proc/interrupts
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 4 0 0 0 IO-APIC 2-edge timer
1: 1528 0 0 4671 IO-APIC 1-edge i8042
8: 1 0 0 0 IO-APIC 8-edge rtc0
9: 0 0 0 0 IO-APIC 9-fasteoi acpi
12: 1527 0 106440 0 IO-APIC 12-edge i8042
14: 0 0 0 0 IO-APIC 14-edge ata_piix
15: 0 0 0 0 IO-APIC 15-edge ata_piix
16: 254 71759 0 0 IO-APIC 16-fasteoi vmwgfx, snd_ens1371
17: 27453 0 0 0 IO-APIC 17-fasteoi ehci_hcd:usb1, ioc0
18: 0 62 0 0 IO-APIC 18-fasteoi uhci_hcd:usb2
19: 0 56 0 14293 IO-APIC 19-fasteoi ens33
24: 0 0 0 0 PCI-MSI 344064-edge PCIe PME, pciehp
25: 0 0 0 0 PCI-MSI 346112-edge PCIe PME, pciehp
26: 0 0 0 0 PCI-MSI 348160-edge PCIe PME, pciehp
27: 0 0 0 0 PCI-MSI 350208-edge PCIe PME, pciehp
28: 0 0 0 0 PCI-MSI 352256-edge PCIe PME, pciehp
29: 0 0 0 0 PCI-MSI 354304-edge PCIe PME, pciehp
30: 0 0 0 0 PCI-MSI 356352-edge PCIe PME, pciehp
31: 0 0 0 0 PCI-MSI 358400-edge PCIe PME, pciehp
32: 0 0 0 0 PCI-MSI 360448-edge PCIe PME, pciehp
33: 0 0 0 0 PCI-MSI 362496-edge PCIe PME, pciehp
34: 0 0 0 0 PCI-MSI 364544-edge PCIe PME, pciehp
35: 0 0 0 0 PCI-MSI 366592-edge PCIe PME, pciehp
36: 0 0 0 0 PCI-MSI 368640-edge PCIe PME, pciehp
37: 0 0 0 0 PCI-MSI 370688-edge PCIe PME, pciehp
38: 0 0 0 0 PCI-MSI 372736-edge PCIe PME, pciehp
39: 0 0 0 0 PCI-MSI 374784-edge PCIe PME, pciehp
40: 0 0 0 0 PCI-MSI 376832-edge PCIe PME, pciehp
41: 0 0 0 0 PCI-MSI 378880-edge PCIe PME, pciehp
42: 0 0 0 0 PCI-MSI 380928-edge PCIe PME, pciehp
43: 0 0 0 0 PCI-MSI 382976-edge PCIe PME, pciehp
44: 0 0 0 0 PCI-MSI 385024-edge PCIe PME, pciehp
45: 0 0 0 0 PCI-MSI 387072-edge PCIe PME, pciehp
46: 0 0 0 0 PCI-MSI 389120-edge PCIe PME, pciehp
47: 0 0 0 0 PCI-MSI 391168-edge PCIe PME, pciehp
48: 0 0 0 0 PCI-MSI 393216-edge PCIe PME, pciehp
49: 0 0 0 0 PCI-MSI 395264-edge PCIe PME, pciehp
50: 0 0 0 0 PCI-MSI 397312-edge PCIe PME, pciehp
51: 0 0 0 0 PCI-MSI 399360-edge PCIe PME, pciehp
52: 0 0 0 0 PCI-MSI 401408-edge PCIe PME, pciehp
53: 0 0 0 0 PCI-MSI 403456-edge PCIe PME, pciehp
54: 0 0 0 0 PCI-MSI 405504-edge PCIe PME, pciehp
55: 0 0 0 0 PCI-MSI 407552-edge PCIe PME, pciehp
56: 0 112 11460 0 PCI-MSI 1130496-edge ahci[0000:02:05.0]
57: 0 0 0 0 PCI-MSI 129024-edge vmw_vmci
58: 0 0 0 0 PCI-MSI 129025-edge vmw_vmci
NMI: 0 0 0 0 Non-maskable interrupts
LOC: 976787 307883 248740 258994 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 0 0 0 0 Performance monitoring interrupts
IWI: 0 0 0 2 IRQ work interrupts
RTR: 0 0 0 0 APIC ICR read retries
RES: 231148 202631 219048 215288 Rescheduling interrupts
CAL: 15875 19615 20240 18922 Function call interrupts
TLB: 32096 22394 25769 24188 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
DFR: 0 0 0 0 Deferred Error APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 74 75 75 75 Machine check polls
ERR: 0
MIS: 0
PIN: 0 0 0 0 Posted-interrupt notification event
NPI: 0 0 0 0 Nested posted-interrupt event
PIW: 0 0 0 0 Posted-interrupt wakeup event
- 在插入模块时，你对每个中断都作为参数试运行一下，看看会出现什么问题？
- 思考一下irq为0,3等值时，为什么插入失败？
- 这就引出中断的共享和非共享问题，从而促使你分析Linux对共享的中断到底如何处理，共享同一个中断号的中断处理程序到底如何执行？
对于myinterrupt（）函数，可以进行怎样的改进，使得这个自定义的中断处理程序变得有实际意义？
static irqreturn_t myinterrupt(int irq, void *dev_id, struct pt_regs *regs) {
static int mycount = 0;
if (mycount < 10) {
printk("Interrupt!\n");
mycount++; }
return IRQ_NONE;
}
比如，对于网卡中断，在此收集每一次中断发生时，从网卡接收到的数据，把其存入到文件中。以此思路，随你考虑应用场景了。
- 模块机制给Linux内核的扩展和应用提供了方便的入口，在我们内核之旅http://http://wwww.kerneltravel.net/ 的电子杂志部分，针对内核相关的内容，每一部分都有相对比较实际的内核应用题目，感兴趣者可以去实践，前提是对内核相关内容的彻透理解。