kexec based crash dumping

Hi Andrew,

The patches that follow contain the kexec based crash dumping implementation.
Based on feedback received last time, we have made several changes. Some of
them are:

- The dumping kernel now boots from a non-default location. This is possible
  due to Eric's patch which allows i386 kernels to boot from a non-default
  location. This change means that we need two different kernels to get this
  setup. The documentation patch has complete details on how to do this.
- We can now choose whether or not to dump from panic. The documentation
  patch has details on this as well.
- The linear view is now called oldmem.
- Changes as per the code review comments from the previous posting.

The patches correspond to 2.6.9-rc1-mm5.

Kindly review these patches and let me know your thoughts.

Regards, Hari
-- 
Hariprasad Nellitheertha
Linux Technology Center
India Software Labs
IBM India, Bangalore
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