[Bug 2031841] Re: initramfs-tools and dracut install different sets of kernel modules

[Benjamin Drung]

Regression: bug #2042710

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Title:
  initramfs-tools and dracut install different sets of kernel modules

Status in initramfs-tools package in Ubuntu:
  Fix Released

Bug description:
  initramfs-tools and dracut install different sets of kernel modules. Either these modules are not needed for booting or are missing in the other project.
  dracut-install can filter modules by symbol (--mod-filter-symbol) to select modules more fine-grain. Harmonize the set of modules.

  Adopt the install rules from dracut to get rid of modules that are
  shipped in initramfs-tools, but not in dracut. Following kernel
  modules will be kept since they are mentioned in the initramfs-tools
  code:

  * via hidden_dep_add_modules: psmouse mlx5_ib mlx4_ib
  * via framebuffer hook: =drivers/gpu vga16fb =drivers/char/agp
  * explicit in auto_add_modules: extcon-usb-gpio extcon-usbc-cros-ec cros_ec_spi
  * via hw_random in auto_add_modules: =drivers/char/hw_random
  * via fb in auto_add_modules: pwm-cros-ec pwm_bl
  * ignored difference for now: =drivers/mmc
  * via virtual in auto_add_modules: hv_utils
  * not analyzed yet: mhi_ep mhi mhi_pci_generic i2c-mux i2c-mux-gpio i2c-mux-ltc4306 i2c-mux-mlxcpld i2c-mux-pca9541 i2c-mux-pca954x i2c-mux-reg c67x00

  Following modules will be removed from initramfs-tools with this
  change, but are in dracut (pulled in as dependency): intel_pmc_bxt
  kempld-core rave-sp retu-mfd nandcore bch

  If that change removed too much, we need to add it back and also
  report that to dracut to add it there as well.

  Test setup: mantic schroot with linux 6.3.0-7-generic and following
  packages: linux-image-generic,zstd,busybox-initramfs,cryptsetup-
  initramfs,isc-dhcp-client,kbd,lvm2,mdadm,ntfs-3g,plymouth,plymouth-
  theme-spinner,initramfs-tools,dracut-core,dracut-config-
  generic,dcracut-network

  initramfs generation with dracut: dracut --regenerate-all --force -q
  --add-drivers "=drivers/char/agp hv_utils =drivers/mmc pwm-cros-ec
  pwm_bl mlx4_ib extcon-usb-gpio extcon-usbc-cros-ec cros_ec_spi
  =drivers/gpu vga16fb psmouse mlx5_ib =drivers/char/hw_random"

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