kernel: memory related messages appear in /var/log/messages at boot time

Issue

• There were warning messages related to kernel in /var/log/messages logs during the system started up.
• What does the message mean? It it harmful?

May 23 12:02:57 rhel7 kernel: Zone ranges:
May 23 12:02:57 rhel7 kernel:  DMA      [mem 0x00001000-0x00ffffff]
May 23 12:02:57 rhel7 kernel:  DMA32    [mem 0x01000000-0xffffffff]
May 23 12:02:57 rhel7 kernel:  Normal   empty
May 23 12:02:57 rhel7 kernel: Movable zone start for each node
May 23 12:02:57 rhel7 kernel: Early memory node ranges
May 23 12:02:57 rhel7 kernel:  node   0: [mem 0x00001000-0x0009afff]
May 23 12:02:57 rhel7 kernel:  node   0: [mem 0x00100000-0x3fffbfff]