Re: Build Failure on linux-next (next-20250407)

[Ard Biesheuvel]

On Wed, 9 Apr 2025 at 07:01, Borah, Chaitanya Kumar
<chaitanya.kumar.borah@xxxxxxxxx> wrote:
>
> Hello Ard,
>
> Hope you are doing well. I am Chaitanya from the linux graphics team in Intel.
>
> This mail is regarding a build failure we are seeing in our CI runs[1] on linux-next repository.
>
> Since the version next-20250407[2], we are seeing the following build error.
>
> `````````````````````````````````````````````````````````````````````````````````
> CALL    scripts/checksyscalls.sh
>   DESCEND objtool
>   INSTALL libsubcmd_headers
>   AS      arch/x86/boot/startup/efi-mixed.o
> arch/x86/boot/startup/efi-mixed.o: error: objtool: efi64_stub_entry(): can't find starting instruction
> make[3]: *** [scripts/Makefile.build:335: arch/x86/boot/startup/efi-mixed.o] Error 255
> make[3]: *** Deleting file 'arch/x86/boot/startup/efi-mixed.o'
> make[2]: *** [scripts/Makefile.build:461: arch/x86/boot/startup] Error 2
> make[1]: *** [/home/kbuild2/kernel/Makefile:2006: .] Error 2
> make: *** [Makefile:248: __sub-make] Error 2
> `````````````````````````````````````````````````````````````````````````````````
>
> After bisecting the tree, the following patch [3] seems to be the first "bad" commit
>
> `````````````````````````````````````````````````````````````````````````````````````````````````````````
> commit 4f2d1bbc2c92a32fd612e6c3b51832d5c1c3678e
> Author: Ard Biesheuvel mailto:ardb@xxxxxxxxxx
> Date:   Tue Apr 1 15:34:20 2025 +0200
>
>     x86/boot: Move the EFI mixed mode startup code back under arch/x86, into startup/
> `````````````````````````````````````````````````````````````````````````````````````````````````````````
>
> We also verified that if we revert the patch the issue is not seen.
>
> Another observation is that build passes when run on "Ubuntu 20.04", in contrast our CI systems uses "Ubuntu 24.04".
>
> Could you please check why the patch causes this regression and provide a fix if necessary?
>

This should fix it. Please reply to the patch with a tested-by if it
fixes the issue for you.

https://lore.kernel.org/linux-efi/20250408085254.836788-10-ardb+git@xxxxxxxxxx/T/#u