[Bug 2007365] Re: rtl8821ce fails to build when CONFIG_CFG80211 is not enabled

[Ubuntu Foundations Team Bug Bot]

The attachment "rtl8821ce_5.5.2.1-0ubuntu11~0.22.04.1-2.debdiff" seems
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Title:
  rtl8821ce fails to build when CONFIG_CFG80211 is not enabled

Status in ubuntu-kernel-tests:
  New
Status in rtl8821ce package in Ubuntu:
  New
Status in rtl8821ce source package in Jammy:
  New

Bug description:
  [SRU Justification]

  Impact:
  jammy:linux-kvm does not have CONFIG_CFG80211 enabled.
  Module rtl8821ce-dkms requires it, otherwise build will fail.
  Build was not performed before because of this rule:

  # Only build on wifi enabled kernels
  if ! grep -q '^CONFIG_CFG80211=[ym]$' $kernel_source_dir/.config; then
  BUILD_EXCLUSIVE_KERNEL="^$"
  fi

  But in the last update: 5.5.2.1-0ubuntu11~0.22.04.1 this was overridden by
  BUILD_EXCLUSIVE_KERNEL="^5.15.*"
  instead of appending the new exclude rule.

  This lead to new regression in autopkgtest for jammy:linux-
  kvm-5.15.0-1029.34.

  Fix
  Append the last rule:

  BUILD_EXCLUSIVE_KERNEL+=" ^5.15.*"

  Tescase 
  autopkgtest rtl8821ce fails during build with the error from below

  Regression potential:
  None. Build is skipped so no tests are performed.
  ...
  ERROR: modpost: "cfg80211_rx_mgmt_khz" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_mgmt_tx_status" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "wiphy_apply_custom_regulatory" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "__cfg80211_alloc_reply_skb" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_new_sta" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_inform_bss_frame_data" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_unlink_bss" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_connect_done" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_put_bss" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  ERROR: modpost: "cfg80211_roamed" [/var/lib/dkms/rtl8821ce/5.5.2.1/build/rtl8821ce.ko] undefined!
  WARNING: modpost: suppressed 18 unresolved symbol warnings because there were too many)
  make[2]: *** [scripts/Makefile.modpost:133: /var/lib/dkms/rtl8821ce/5.5.2.1/build/Module.symvers] Error 1
  make[2]: *** Deleting file '/var/lib/dkms/rtl8821ce/5.5.2.1/build/Module.symvers'
  make[1]: *** [Makefile:1821: modules] Error 2
  make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-1029-kvm'
  make: *** [Makefile:2262: modules] Error 2
  ====================
  ./rtl8821ce/5.5.2.1/build/make.log
  autopkgtest [02:46:16]: test dkms-autopkgtest: -----------------------]
  dkms-autopkgtest     FAIL non-zero exit status 1
  autopkgtest [02:46:17]: test dkms-autopkgtest:  - - - - - - - - - - results - - - - - - - - - -
  autopkgtest [02:46:17]: @@@@@@@@@@@@@@@@@@@@ summary
  dkms-autopkgtest     FAIL non-zero exit status 1
  Creating nova instance adt-jammy-amd64-rtl8821ce-20230214-023910-lrg-root1 from image adt/ubuntu-jammy-amd64-server-20230213.img (UUID ed711e13-2823-486e-8ade-d9996e82af9a)...

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