linux-kernel - Re: linux-next: build warnings after merge of the tip tree

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Message-ID: <CAFULd4Y4n4uGy-pTc0PD6+-OytzGZHeJTPZ_CPJDq7VM7ChRdA@mail.gmail.com>
Date:   Mon, 4 Dec 2023 08:02:56 +0100
From:   Uros Bizjak <ubizjak@...il.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warnings after merge of the tip tree

On Mon, Dec 4, 2023 at 5:08 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi Uros,
>
> On Fri, 1 Dec 2023 13:09:45 +0100 Uros Bizjak <ubizjak@...il.com> wrote:
> >
> > On Fri, Dec 1, 2023 at 1:29 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > >
>  > After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> > > produced these warnings:
> > >
> > > WARNING: modpost: EXPORT symbol "const_pcpu_hot" [vmlinux] version generation failed, symbol will not be versioned.
> > > Is "const_pcpu_hot" prototyped in <asm/asm-prototypes.h>?
> > > WARNING: modpost: "const_pcpu_hot" [arch/x86/kernel/msr.ko] has no CRC!
> > > WARNING: modpost: "const_pcpu_hot" [arch/x86/kvm/kvm.ko] has no CRC!
> >
> > My build doesn't produce any warnings. A defconfig + enabling kvm.ko as module:
> >
> > ...
> >  AR      built-in.a
> >  AR      vmlinux.a
> >  LD      vmlinux.o
> >  OBJCOPY modules.builtin.modinfo
> >  GEN     modules.builtin
> >  MODPOST Module.symvers
> >  CC      .vmlinux.export.o
> >  CC [M]  arch/x86/kvm/kvm.mod.o
> >  CC [M]  fs/efivarfs/efivarfs.mod.o
> > ...
> >
> > Does the attached patch help? Or is there anything else I should do to
> > trigger the above problem?
>
> The patch does not help.  I am just doing an X86_64 allmodconfig build
> with CONFIG_WERROR=n. gcc is
>
> $ x86_64-linux-gnu-gcc --version
> x86_64-linux-gnu-gcc (Debian 13.2.0-2) 13.2.0
>
> This is a cross build with a ppc64le host.

The warning is triggered by CONFIG_MODVERSIONS=y and will be fixed in
a different way by the patch in [1].

[1] https://lore.kernel.org/lkml/20231203232017.994963-1-ubizjak@gmail.com/

Thanks,
Uros.