Re: [REGRESSION] Linux kernel 6.12.75 fails to compile with -Werror=implicit-function-declaration

[Peter Schneider]

Am 04.03.2026 um 18:35 schrieb Aditya Garg:
> Hi
>
> I found out that Linux kernel 6.12.75 failed to compiled in my automatic builds. The compiler throws the error:
>
> arch/x86/kernel/setup.c: In function 'ima_get_kexec_buffer':
> arch/x86/kernel/setup.c:380:15: error: implicit declaration of function 'ima_validate_range' [-Werror=implicit-function-declaration]
> 380 |         ret = ima_validate_range(ima_kexec_buffer_phys, ima_kexec_buffer_size);
>      |               ^~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
> make[7]: *** [scripts/Makefile.build:229: arch/x86/kernel/setup.o] Error 1
> make[6]: *** [scripts/Makefile.build:466: arch/x86/kernel] Error 2
> make[5]: *** [scripts/Makefile.build:466: arch/x86] Error 2

I already found and reported this in the RC cycle [1], and Sasha dropped it in -rc2 [2], and now in the release, it 
obviously has, somewhat mysteriously, reappeared [3], affecting all of today's 6.x stable branch releases.


[1] https://lore.kernel.org/stable/66461c13-1bb3-473c-b57f-adba9db4f756@xxxxxxxxxxxxxx/
[2] https://lore.kernel.org/stable/a04b1aa6-ba46-4368-9dfe-6320a2dafa79@xxxxxxxxxxxxxx/
[3] https://lore.kernel.org/stable/c435a3c6-5952-453f-9e50-31e0c6cdd09f@xxxxxxxxxxxxxx/


Beste Grüße,
Peter Schneider

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