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Date:   Fri, 23 Oct 2020 19:17:54 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Daniel =?iso-8859-1?Q?D=EDaz?= <daniel.diaz@linaro.org>
Cc:     Ben Gardon <bgardon@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
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        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
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Subject: Re: kvm: x86-32 fails to link with tdp_mmu
Message-ID: <20201024021754.GC7824@linux.intel.com>
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On Fri, Oct 23, 2020 at 09:13:21PM -0500, Daniel Díaz wrote:
> Hello!
> 
> We found the following problem building torvalds/master, which
> recently merged the for-linus tag from the KVM tree, when building
> with gcc 7.3.0 and glibc 2.27 for x86 32-bits under OpenEmbedded:
> 
> |   LD      vmlinux.o
> |   MODPOST vmlinux.symvers
> |   MODINFO modules.builtin.modinfo
> |   GEN     modules.builtin
> |   LD      .tmp_vmlinux.kallsyms1
> | arch/x86/kvm/mmu/tdp_mmu.o: In function `__handle_changed_spte':
> | tdp_mmu.c:(.text+0x78a): undefined reference to `__umoddi3'

The problem is a % on a 64-bit value.  Patches incoming, there's also a goof
in similar code that was tweaked last minute to avoid the %.