linux-kernel - Re: [PATCH] x86: kvm: avoid -Wshadow warning in header

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Date:   Wed, 28 Oct 2020 10:04:32 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Arnd Bergmann <arnd@...db.de>,
        Gleb Natapov <gleb@...hat.com>, Avi Kivity <avi@...hat.com>,
        Ingo Molnar <mingo@...e.hu>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: kvm: avoid -Wshadow warning in header

On Mon, Oct 26, 2020 at 05:14:39PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> There are hundreds of warnings in a W=2 build about a local
> variable shadowing the global 'apic' definition:
> 
> arch/x86/kvm/lapic.h:149:65: warning: declaration of 'apic' shadows a global declaration [-Wshadow]
> 
> Avoid this by renaming the local in the kvm/lapic.h header

Rather than change KVM, and presumably other files as well, e.g. kvm/lapic.c and
apic/io_apic.c also shadow 'apic' all over the place, what about renaming the
global 'apic' to something more unique?  KVM aside, using such a common name for
a global variable has always struck me as a bit odd/dangerous/confusing.