Undefined reference to ioremap

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http://www.linuxquestions.org – Hello, all I am a beginner in linux. Now I am trying to access PCI Configuration register use memory mapping method - ioremap(), inb() and outb(). But, error 'Undefined reference to ioremap' occurs during compile/link. My development environment is user, not kernel. Is it impossible use kernel function like ioremap() under user environment? Joseph Chung (HowTos)