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

[Suren Baghdasaryan <surenb@google.com>]

On Thu, Aug 22, 2024 at 10:18 AM LEROY Christophe
<christophe.leroy2@cs-soprasteria.com> wrote:
>
>
>
> Le 21/07/2024 à 01:09, Erhard Furtner a écrit :
> > [Vous ne recevez pas souvent de courriers de erhard_f@mailbox.org. D?couvrez pourquoi ceci est important ? https://aka.ms/LearnAboutSenderIdentification ]
> >
> > On Sat, 29 Jun 2024 15:31:28 +0200
> > Erhard Furtner <erhard_f@mailbox.org> 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.
> >
>
> I guess those three functions are missing EXPORT_SYMBOL_GPL() tagging.

The issue should have been fixed by
https://lore.kernel.org/all/20240717181239.2510054-1-surenb@google.com/
patchset. I probably forgot to CC stable@ for these changes. Let me
check and follow up.
Thanks,
Suren.

>
> Christophe