Remove EISA support from main kernel image and make it M (modular)

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apport-collect 1543919

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This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Why "Incomplete"? There's nothing to supply. I simply need some maintainer's/kernel team's/iuser's feedback on this.
Funny enough that even if I muzzled that bot, "New" still gets auto-changed to "Incomplete", this time even without an explanation.
Brad, let your bots behave a little more nicely. Yes, _still_.

Hi all,
Noticed this in my Ubuntu 19.04 dmesg:

[ 2.094782] platform eisa.0: Probing EISA bus 0
[ 2.094783] platform eisa.0: EISA: Cannot allocate resource for mainboard
[ 2.094784] platform eisa.0: Cannot allocate resource for EISA slot 1
[ 2.094785] platform eisa.0: Cannot allocate resource for EISA slot 2
[ 2.094786] platform eisa.0: Cannot allocate resource for EISA slot 3
[ 2.094787] platform eisa.0: Cannot allocate resource for EISA slot 4
[ 2.094788] platform eisa.0: Cannot allocate resource for EISA slot 5
[ 2.094789] platform eisa.0: Cannot allocate resource for EISA slot 6
[ 2.094790] platform eisa.0: Cannot allocate resource for EISA slot 7
[ 2.094791] platform eisa.0: Cannot allocate resource for EISA slot 8
[ 2.094792] platform eisa.0: EISA: Detected 0 cards

First time I've ever seen this on Ubuntu or any other distributions. My motherboard is an Asus Crosshair V Formula - not that new but not that old also, I think from 2011 or there abouts.

Maybe there is a kernel option to avoid scanning for EISA buses ?

Still warning messages emitted to kernel log each boot.

Ubuntu 20.04.1 LTS
5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

I'm running over 10 year old systems and I don't need built-in support for EISA. Does anybody even know anybody running old enough hardware to require built-in support? Does anybody even know a use case where a module wouldn't be enough?

Still an issue with latest kernel on 20.10

# uname -a
Linux Workstation 5.8.0-43-generic #49-Ubuntu SMP Fri Feb 5 03:01:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

I've an emachines®/acer® EL1210-09 (Advance Micro Devices Inc. Athlon LE-1620 (P/N ADH1620IAA5DH); nVIDIA® nForce® 780a SLI with planar C77 a2 GPU; nVIDIA® GF119 a1 GPU on PCIe 2.0 x16 slot). The system DMesg predictably detects no EISA resources on probing platform eisa.0, so EISA.c and related headers can be compiled as a module with no effect on my system's kernel initialization. AFAIK, Intel PCI has replaced EISA on all x86 and x86_64 systems built after 2000. The following redact from /var/log/dmesg.0 on 17 July 2021 illustrates typical info:

[ 0.000000] kernel: Linux version 5.8.0-59-generic (buildd@lcy01-amd64-022) (gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #66~20.04.1-Ubuntu SMP Thu Jun 17 11:14:10 UTC 2021 (Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18)
[ 0.000000] kernel: Command line: BOOT_IMAGE=/vmlinuz-5.8.0-59-generic root=UUID=c4248af1-a4cf-49a2-ba18-4de2c65c815c ro acpi_force_32bit_fadt_addr acpi_rev_override check_enable_amd_mmconf pcie_bus_tune=off pcie_aspm=off pci_ports=native intremap=off agp=off nohugeiomap parport=0 hashdist=0
...
[ 0.212298] kernel: EISA bus registered
...
[ 1.006643] kernel: platform eisa.0: Probing EISA bus 0
[ 1.006715] kernel: platform eisa.0: EISA: Cannot allocate resource for mainboard
[ 1.006779] kernel: platform eisa.0: Cannot allocate resource for EISA slot 1
[ 1.006855] kernel: platform eisa.0: Cannot allocate resource for EISA slot 8
[ 1.006917] kernel: platform eisa.0: EISA: Detected 0 cards

I concur on the feasibility of offloading EISA from Kernel core and building a Module EISA.ko.