Re: [RFC v3 0/3] Import Kernel uAPI header files

[Ferruh Yigit <ferruh.yigit@amd.com>]

On 9/11/2024 8:32 PM, Maxime Coquelin wrote:
> This series enables importing Linux Kernel uAPI headers
> into the DPDK repository. It aims at solving alignment
> issues between the build system and the system applications
> linked ot DPDK libraries are run on.
> 

Hi Maxime,

Is the imported Linux Kernel uAPI headers are always backward compatible?

If I build and run on identical platform, lets say has kernel v5.4,
and DPDK has the kernel uAPI header from v6.10, is this has any chance
to create backward compatibility issues?
Or can it enable some features which are indeed not exist/supported in
the platform that has old version of kernel?

> It can also help simplify spaghetti code done to support
> different versions of the Linux Kernel headers used by
> the build system.
> 
> Guidelines and import script are also part of first patch.
> A uAPI checker script is added in this 3rd RFC, goals is to
> use it in CI for any patch touching linux-headers/uapi.
> 
> Follow-up patches are an example of imported uAPI inclusion
> of VDUSE header into the Vhost library.
> 
> Morten, I did not (again) apply your Ack on patch 1, as it
> has some significant changes and additions.
> 
> Changes in RFC v3:
> ==================
> - Support nested headers include
> - Interactive mode to select which headers to include
> - Store version in a file instead of git commit messages
> - All imported headers aligned on same version
> - Improve loops in scripts (David)
> - Update documentation
> 
> 
> Changes in RFC v2:
> ==================
> - Fix typos in documentation and commit messags (David, Morten)
> - Add uAPI checker script
> - Add uAPI to global_inc
> - Fix build issues on FreeBSD and documentation (CI, David)
> - Simplify import script (David)
> 
> Maxime Coquelin (3):
>   uapi: introduce kernel uAPI headers import
>   uapi: import VDUSE header
>   vduse: use imported VDUSE uAPI header
> 
>  devtools/check-linux-uapi.sh           |  85 ++++++
>  devtools/import-linux-uapi.sh          | 119 +++++++++
>  doc/guides/contributing/index.rst      |   1 +
>  doc/guides/contributing/linux_uapi.rst |  71 +++++
>  lib/vhost/meson.build                  |   5 +-
>  lib/vhost/vduse.c                      |   2 +-
>  lib/vhost/vduse.h                      |  22 --
>  linux-headers/uapi/.gitignore          |   4 +
>  linux-headers/uapi/linux/vduse.h       | 353 +++++++++++++++++++++++++
>  linux-headers/uapi/version             |   1 +
>  meson.build                            |   8 +-
>  11 files changed, 642 insertions(+), 29 deletions(-)
>  create mode 100755 devtools/check-linux-uapi.sh
>  create mode 100755 devtools/import-linux-uapi.sh
>  create mode 100644 doc/guides/contributing/linux_uapi.rst
>  create mode 100644 linux-headers/uapi/.gitignore
>  create mode 100644 linux-headers/uapi/linux/vduse.h
>  create mode 100644 linux-headers/uapi/version
>