openafs-modules-dkms FTBS with kernel 6.2 on jammy

[Impact]

/var/lib/dkms/openafs/1.8.8.1/build/src/libafs/MODLOAD-6.2.0-23-generic-SP/osi_vnodeops.c:132:34: error: implicit declaration of function ‘__pagevec_lru_add’; did you mean ‘pagevec_add’? [-Werror=implicit-function-declaration]
  132 | # define __pagevec_lru_add_file __pagevec_lru_add
      | ^~~~~~~~~~~~~~~~~
/var/lib/dkms/openafs/1.8.8.1/build/src/libafs/MODLOAD-6.2.0-23-generic-SP/osi_vnodeops.c:140:9: note: in expansion of macro ‘__pagevec_lru_add_file’
  140 | __pagevec_lru_add_file(&alrupages->lrupv);
      | ^~~~~~~~~~~~~~~~~~~~~~
/var/lib/dkms/openafs/1.8.8.1/build/src/libafs/MODLOAD-6.2.0-23-generic-SP/osi_vnodeops.c: In function ‘afs_linux_read_cache’:
/var/lib/dkms/openafs/1.8.8.1/build/src/libafs/MODLOAD-6.2.0-23-generic-SP/osi_vnodeops.c:2272:20: error: implicit declaration of function ‘add_to_page_cache’; did you mean ‘add_to_page_cache_lru’? [-Werror=implicit-function-declaration]
 2272 | code = add_to_page_cache(newpage, cachemapping,
      | ^~~~~~~~~~~~~~~~~
      | add_to_page_cache_lru

[Test case]

 $ sudo apt install openafs-modules-dkms

With the fix applied:

 - release kernel 5.15:

Building for 5.15.0-77-generic
Building initial module for 5.15.0-77-generic
EFI variables are not supported on this system
/sys/firmware/efi/efivars not found, aborting.
Done.

openafs.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.15.0-77-generic/updates/dkms/

 - hwe kernel 6.2:

Building for 6.2.0-25-generic
Building initial module for 6.2.0-25-generic
EFI variables are not supported on this system
/sys/firmware/efi/efivars not found, aborting.
Done.

openafs.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/6.2.0-25-generic/updates/dkms/

[Fix]

Backport the right patches from lunar to properly support the new Linux 6.2 kernel ABI.

[Regression potential]

We may experience regressions in systems using openafs, other kernel subsystems / packages won't be affected by this change.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: openafs-modules-dkms 1.8.8.1-3ubuntu2~22.04.1
ProcVersionSignature: User Name 6.2.0-23.23~22.04.1-generic 6.2.12
Uname: Linux 6.2.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Mon Jun 12 09:13:47 2023
PackageArchitecture: all
SourcePackage: openafs
UpgradeStatus: No upgrade log present (probably fresh install)