These patches are against latest kexec-tool master branch from: git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools The cleanups are intended to do no functional change. The patches got successfully tested on one platform. Also the e820 passing should introduce no change. Whether the memmap=exactmap ... is passed and the crash kernel makes up the e820 table from memmap=X#Y and similar params or whether exactly the same ranges are passed via e820 in bootloader structure directly should not matter at all.
