[Buildroot] [Bug 15551] New: Linux extensions are not applied to linux-headers package

[Buildroot] [Bug 15551] New: Linux extensions are not applied to linux-headers package

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=15551

            Bug ID: 15551
           Summary: Linux extensions are not applied to linux-headers
                    package
           Product: buildroot
           Version: 2023.02
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned@buildroot.uclibc.org
          Reporter: bradley.gamble@ncipher.com
                CC: buildroot@uclibc.org
  Target Milestone: ---

Created attachment 9586
  --> https://bugs.busybox.net/attachment.cgi?id=9586&action=edit
Example of the difference between the linux and linux-headers trees following
an extension being applied.

Linux extensions are a mechanism for providing new features through
modification to the Linux kernel tree. This is usually in the form of patches
or new files from an out-of-tree source. (See Buildroot manual section 18.22.2.
linux-kernel-extensions).

Currently during a build the Linux extensions are applied to the linux source
tree, but not the linux-headers source tree. In comparison, the global and
Linux patch directories are applied to both the linux and linux-headers source
trees. This can lead issues where the source of the linux-headers does not
represent the kernel running on the target - For example, linux-headers is
consumed by most C libraries.

I have encountered this when attempting to write a patch that modifies an
applied kernel extension. The patch fails to apply to linux-headers as the
source files added by the extension do not exist.

This can be reproduced this by enabling a Linux extension (I've tested with
fbtft and ev3dev-linux-drivers) and performing a build, then comparing the
linux and linux-headers build directories - I have attached a diff example
showing the additions in one source tree but not the other.

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[Buildroot] [Bug 15551] Linux extensions are not applied to linux-headers package

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=15551

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yann.morin.1998@free.fr
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #1 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Thank you for your report.

The issue tracker for the Buildroot project has been moved to
the Gitlab.com issue tracker:
    https://gitlab.com/buildroot.org/buildroot/-/issues

We are taking this opportunity to close old issues in this old
tracker. If you believe your issue is still relevant, please
open one in the new issue tracker.

Thank you!

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