There is 1 Error in dmesg ... what does it mean ??? DPC: RP PIO log size 0 is invalid

[tpetersohn]

0.572472] ACPI: Power Resource [TBT1] (on)
[ 0.572590] ACPI: Power Resource [D3C] (on)
[ 0.701958] ACPI: Power Resource [PIN] (off)
[ 0.702656] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-fe])
[ 0.702663] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI EDR HPX-Type3]
[ 0.708875] acpi PNP0A08:00: _OSC: platform does not support [AER]
[ 0.715927] acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug SHPCHotplug PME PCIeCapability LTR DPC]
[ 0.721506] PCI host bridge to bus 0000:00
[ 0.721508] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
[ 0.721510] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
[ 0.721511] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[ 0.721513] pci_bus 0000:00: root bus resource [mem 0x35400000-0xbfffffff window]
[ 0.721514] pci_bus 0000:00: root bus resource [mem 0x4000000000-0x7fffffffff window]
[ 0.721515] pci_bus 0000:00: root bus resource [bus 00-fe]
[ 0.721557] pci 0000:00:00.0: [8086:8a12] type 00 class 0x060000
[ 0.724156] pci 0000:00:02.0: [8086:8a52] type 00 class 0x030000
[ 0.724173] pci 0000:00:02.0: reg 0x10: [mem 0x601c000000-0x601cffffff 64bit]
[ 0.724182] pci 0000:00:02.0: reg 0x18: [mem 0x4000000000-0x400fffffff 64bit pref]
[ 0.724188] pci 0000:00:02.0: reg 0x20: [io 0x2000-0x203f]
[ 0.724211] pci 0000:00:02.0: BAR 2: assigned to efifb
[ 0.724212] pci 0000:00:02.0: DMAR: Skip IOMMU disabling for graphics
[ 0.726064] pci 0000:00:04.0: [8086:8a03] type 00 class 0x118000
[ 0.726097] pci 0000:00:04.0: reg 0x10: [mem 0x601d560000-0x601d56ffff 64bit]
[ 0.728107] pci 0000:00:07.0: [8086:8a1d] type 01 class 0x060400
[ 0.729903] pci 0000:00:07.0: PME# supported from D0 D3hot D3cold

[ 0.729926] pci 0000:00:07.0: DPC: RP PIO log size 0 is invalid

[ 0.732160] pci 0000:00:0d.0: [8086:8a13] type 00 class 0x0c0330
[ 0.732182] pci 0000:00:0d.0: reg 0x10: [mem 0x601d550000-0x601d55ffff 64bit]
[ 0.732253] pci 0000:00:0d.0: PME# supported from D3hot D3cold
[ 0.734323] pci 0000:00:0d.1: [8086:8a15] type 00 class 0x0c03fe
[ 0.734347] pci 0000:00:0d.1: reg 0x10: [mem 0x601d200000-0x601d3fffff 64bit]
[ 0.734359] pci 0000:00:0d.1: reg 0x18: [mem 0x601d584000-0x601d584fff 64bit]
[ 0.734413] pci 0000:00:0d.1: PME# supported from D0 D3hot
[ 0.736302] pci 0000:00:0d.2: [8086:8a17] type 00 class 0x088000
[ 0.736321] pci 0000:00:0d.2: reg 0x10: [mem 0x601d500000-0x601d53ffff 64bit]
[ 0.736331] pci 0000:00:0d.2: reg 0x18: [mem 0x601d583000-0x601d583fff 64bit]
[ 0.736382] pci 0000:00:0d.2: supports D1 D2
[ 0.736383] pci 0000:00:0d.2: PME# supported from D0 D1 D2 D3hot D3cold
[ 0.738256] pci 0000:00:14.0: [8086:34ed] type 00 class 0x0c0330
[ 0.738290] pci 0000:00:14.0: reg 0x10: [mem 0x601d540000-0x601d54ffff 64bit]
[ 0.738412] pci 0000:00:14.0: PME# supported from D3hot D3cold
[ 0.740493] pci 0000:00:14.1: [8086:34ee] type 00 class 0x0c03fe
[ 0.740527] pci 0000:00:14.1: reg 0x10: [mem 0x601d000000-0x601d1fffff 64bit]
[ 0.740544] pci 0000:00:14.1: reg 0x18: [mem 0x601d582000-0x601d582fff 64bit]
[ 0.740634] pci 0000:00:14.1: PME# supported from D0 D3hot
[ 0.742569] pci 0000:00:14.2: [8086:34ef] type 00 class 0x050000
[ 0.742604] pci 0000:00:14.2: reg 0x10: [mem 0x601d578000-0x601d579fff 64bit]
[ 0.742624] pci 0000:00:14.2: reg 0x18: [mem 0x601d581000-0x601d581fff 64bit]
[ 0.744561] pci 0000:00:14.3: [8086:34f0] type 00 class 0x028000
[ 0.744669] pci 0000:00:14.3: reg 0x10: [mem 0x601d574000-0x601d577fff 64bit]
[ 0.745036] pci 0000:00:14.3: PME# supported from D0 D3hot D3cold
[ 0.746944] pci 0000:00:14.5: [8086:34f8] type 00 class 0x080501
[ 0.746984] pci 0000:00:14.5: reg 0x10: [mem 0x601d580000-0x601d580fff 64bit]