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

[Suren Baghdasaryan]

On Thu, Aug 22, 2024 at 11:04 AM Suren Baghdasaryan <surenb at google.com> wrote:
>
> On Thu, Aug 22, 2024 at 10:18 AM LEROY Christophe
> <christophe.leroy2 at 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 at 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 at 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.

The issue is fixed by the patch titled "alloc_tag: outline and export
free_reserved_page()" which has b3bebe44306e SHA in Linus' tree and
first appears in v6.10.3 with SHA 4a9a52b70cce.


> Thanks,
> Suren.
>
> >
> > Christophe