Re: [PATCH 0/2] kbuild: Fallout from moving '-mfentry' check into Kconfig stage

["Lorenzo Stoakes (ARM)" <ljs@kernel.org>]

On Tue, Oct 20, 2026 at 02:52:17PM -0700, Nathan Chancellor wrote:
> Hi all,
>
> Ricardo reported an issue from moving the compiler test for '-mfentry'
> into Kconfig. In testing that patch, I noticed that the kernel.org GCC
> builds for s390 were not probing correctly for '-mfentry' support.
>
> The first patch moves the check for '-mfentry' back into Kbuild where we
> have the proper information for whether this flag is actually supported.
>
> The second patch documents the reasons for these issues for future
> travelers to hopefully avoid these problems.
>
> I plan to take this via kbuild-fixes after sufficient review/comments.

Also a valid solution :)

LGTM so:

Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>

>
> ---
> Nathan Chancellor (2):
>       kbuild: Move testing of '-mfentry' back to Makefile from Kconfig
>       scripts/Kconfig.toolchain: Highlight cc-option differences between Kconfig and Kbuild
>
>  Makefile                  |  3 ++-
>  scripts/Kconfig.toolchain | 23 +++++++++++++++++++----
>  2 files changed, 21 insertions(+), 5 deletions(-)
> ---
> base-commit: 997208ce9f43f01febac956cf9aeffe89945e3c1
> change-id: 20261020-kconfig-fix-mfentry-check-50525bc5a6ca
>
> Best regards,
> --
> Cheers,
> Nathan
>

--
Cheers, Lorenzo