linux.conf.au, January 2003
      PRINCIPLES: Common Library Functions

kmalloc(size, flags) & kfree(ptr)
Physically contiguous memory (< 128k).
If flags == GFP_ATOMIC, can be used in interrupts
vmalloc(size) & vfree(ptr)
Virtually contiguous memory (< total memory).
Can sleep, so can't be used in interrupts
copy_from_user/get_user & copy_to_user/put_user
Get memory from process (current) into kernel, and put back
Badly Broken Interface
Can sleep
printk(format, ... )
Like printf(): print to console.
Not for chit-chat!
udelay(int usecs) & mdelay(int msecs)
Small delays inside the kernel.
include/linux/list.h
include/linux/hash.h
Common routines