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x86: Disable kexec if system has unaccepted memory
On kexec, the target kernel has to know what memory has been accepted. Information in EFI map is out of date and cannot be used. boot_params.unaccepted_memory can be used to pass the bitmap between two kernels on kexec, but the use-case is not yet implemented. Disable kexec on machines with unaccepted memory for now. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
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