linux-kernel - Re: [GIT PULL] objtool/urgent for v5.15-rc4

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Date:   Sun, 3 Oct 2021 11:38:00 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...e.de>, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>
Subject: Re: [GIT PULL] objtool/urgent for v5.15-rc4

On Sun, Oct 3, 2021 at 2:43 AM Borislav Petkov <bp@...e.de> wrote:
>
> - Handle symbol relocations properly due to changes in the toolchains
> which remove section symbols now

Ugh.

This actually causes a new warning for me:

    arch/x86/kvm/emulate.o: warning: objtool: __ex_table+0x4: don't
know how to handle reloc symbol type: kvm_fastop_exception

on an x86-64 allmodconfig build (and my normal clang build for my
actual default config too).

Looking at the kvm code, that kvm_fastop_exception thing is some funky sh*t.

I _think_ the problem is that 'kvm_fastop_exception' is done with bare
asm at the top-level and that triggers some odd interaction with other
section data, but I really don't know.

Anyway, that thing is in my public tree now, because it's better to
get it out and fixed and have the kvm people look at it.

         Linus