Subject: Re: Kernel build failure with MEM_ALLOC_PROFILING=y set (Talos II, v6.10-rc5)

From: Erhard Furtner <[email-masked]>
Date: Sun, 21 Jul 2024 01:09:26 +0200

On Sat, 29 Jun 2024 15:31:28 +0200
Erhard Furtner <[email-masked]> wrote:

> I get a build failure on v6.10-rc5 on my Talos II when MEM_ALLOC_PROFILING=y is enabled:
> 
> [...]
>   LD [M]  fs/xfs/xfs.o
>   LD [M]  fs/bcachefs/bcachefs.o
>   AR      built-in.a
>   AR      vmlinux.a
>   LD      vmlinux.o
>   OBJCOPY modules.builtin.modinfo
>   GEN     modules.builtin
>   GEN     .vmlinux.objs
>   MODPOST Module.symvers
> ERROR: modpost: "page_ext_get" [arch/powerpc/kvm/kvm-hv.ko] undefined!
> ERROR: modpost: "mem_alloc_profiling_key" [arch/powerpc/kvm/kvm-hv.ko] undefined!
> ERROR: modpost: "page_ext_put" [arch/powerpc/kvm/kvm-hv.ko] undefined!
> make[2]: *** [scripts/Makefile.modpost:145: Module.symvers] Fehler 1
> make[1]: *** [/usr/src/linux-stable/Makefile:1886: modpost] Fehler 2
> make: *** [Makefile:240: __sub-make] Fehler 2
> 
> Same .config builds fine without MEM_ALLOC_PROFILING set. Kernel .config attached.

Build problem still there on now released v6.10 with MEM_ALLOC_PROFILING=y.

Can't bisect as build with MEM_ALLOC_PROFILING fails since it's introduction in v6.10-rc1.

Regards,
Erhard