linux-kernel - Re: unneeded internal declaration

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Date:   Wed, 27 Sep 2017 14:38:33 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Nick Desaulniers <nick.desaulniers@...il.com>,
        josh@...htriplett.org,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     kay@...y.org, avi@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: unneeded internal declaration

On 26/09/2017 05:07, Nick Desaulniers wrote:
> today I noticed I was getting the warning:
> 
> arch/x86/kvm/vmx.c:64:32: warning: variable 'vmx_cpu_id' is not needed
> and will not be emitted [-Wunneeded-internal-declaration]
> 
> seems like this was added in commit: e9bda3b3d0ce7 "KVM: VMX:
> Auto-load on CPUs with VMX"
> 
> seems like other call sites of the MODULE_DEVICE_TABLE typically get
> added to an id_table of various driver structs.  Should that be the
> case here, or would a `__unused` modifier be a way forward (if so,
> please confirm, would be a good first bug for a friend)?

It would be __used, not __unused.  But I'm not sure then why things are
working for everyone, wouldn't the MODULE_DEVICE_TABLE cause a linking
error?

What compiler is emitting this warning?

Paolo