[Xen-devel] confusion about the meaning of CONFIG_XEN

["Zang Hongyong" <zanghongyong@xxxxxxxxxx>]

hi all,
  I noticed "CONFIG_XEN" appears many times in Xen source code. I'm confused 
about the meaning of "CONFIG_XEN".
  For example, 
    in "gnttab.c", the definations of gnttab_map() and gnttab_resume() vary 
with "ifdef CONFIG_XEN" or not.
    And I also noticed ifndef CONFIG_XEN , the file <platform-pci.h> is 
included.

  So my questions are
  1)What's the meanning of CONFIG_XEN?  and on which kind of conditions, 
CONFIG_XEN should not be defined?
  2)What is platform-pci for?

  Any advice would be welcome.

Thanks in advance.   

Zang Hongyong
zanghongyong@xxxxxxxxxx
2008-07-07


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