powerpc/kdump: Handle crashkernel memory reservation failure
Memory reservation for crashkernel could fail if there are holes around kdump kernel offset (128M). Fail gracefully in such cases and print an error message. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Tested-by: David Gibson <dgibson@redhat.com> Reviewed-by: Dave Young <dyoung@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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