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Makedumpfile with libkdumpfile support

This whole repository is a proof of concept to see if makedumpfile can switch to using libkdumpfile.

You can clone the repository if you want, but beware that the libkdumpfile branch may get rebased or partially rewritten at any time without prior notice. My intention is to send the commits as a patch set to the kexec mailing list when it's ready.

There were some regressions in the PoC:

• Missing SADUMP support (solved now with libkdumpfile-0.5.0)
• Missing target architectures:
  • arm (32-bit)
  • ia64 (i.e. Itanium, probably no big issue)
  • mips64
  • ppc (32-bit)
  • most paging forms for ppc64
  • sparc64
• Method to iterate over RAM regions (even those that weren't dumped)