device driver interview questions

Device driver interview questions for new commers ,answers will be available soon.

1. Can you tell the memory layout based on Data,BSS,HEAP and STACK ?
2. What is the use of the poll(file, polltable) API ?
3. Tell about the Memory Layout of a Process in Linux ?
4. Tell the relation between malloc() and mmap() ?
5. What is the difference in features between kernel 2.2, 2.4 and 2.6 ?
6. What is a kernel module ?
7. What is the difference between insmod and modprobe ?
8. How will you list the modules ?
9. How do you get the list of currently available drivers ?
10. How will get the driver added into the kernel ? What are Kconfig files ?
11. What are the ways in which linux kernel can be compiled ?
12. What is object file and what are symbols ?
13. Can you tell the memory layout based on Data,BSS,HEAP and STACK ?
14. How will you Access userspace memory from kernel ? What are the various methods ?
15. What is the use of ioctl(inode,file,cmd,arg) ApI ?
16. What is the use of the poll(file, polltable) API ?
17. What is the use of file->private_data in a device driver structure ?
18. What is a device number ?
19. What are the two types of devices drivers from VFS point of view ?
20. What are character devices ?
21. How does the character device driver adds and remove itself from the kernel ?
22. What is the use of register_chrdev and unregister_chrdev ?
23. What is mmap ? MMAP & malloc ? MMAP & brk ? MMAP adv & dis-adv?
24. Advantages of MMAP over Read ?
25. What are Static and Shared libraries ?
26. What is dynamic linking ? What is static linking ?
27. What are the advantages of Dynamic linking or Shared libraries ?
28. Does gcc search for both static and shared libraries ? Which is searched initially by gcc compiler ?
29. What should be done for Shared library based linking in gcc ?
30. What should be done for static library based linking in gcc ?
31. What is the role of interrupts in a device driver ? How are interrupts handled in device driver ?
32. How will you make interrupt handlers as fast as possible ?
33. What are the types of softirqs ?
34. Difference between Timer Softirq and Tasklet Softirq ?
35. What are tasklets ? How are they activated ? when and How are they initialized ?
36. What is task_struct and how are task states maintained ?
37. What is rwlock and spinlock ? Briefly explain about both of them ?
38. When will you use rwlock instead of spinlock ?
39. Can spinlock/rwlock be used in Interrupt handler ?
40. What is Kmalloc and how does it differ from normal malloc ? or Why can't we use malloc in kernel code ?
41. How do you determine the direction of stack growth ?
42. Tell about the method/steps in Linux Kernel Compilation?
43. What is a stack frame, stack pointer & frame pointer ?
44. Tell the role of brk() in malloc / Tell the relation between heap and brk?