linux-kernel - Re: "KVM: x86: enable -Werror" breaks W=1 compilation

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Date:   Thu, 13 Feb 2020 18:23:55 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Qian Cai <cai@....pw>
Cc:     joe@...ches.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: "KVM: x86: enable -Werror" breaks W=1 compilation

On 13/02/20 14:50, Qian Cai wrote:
> People have been running W=1 to catch additional compilation warnings with an
> expectation that not all of warnings will be fixed, but the linux-next commit
> ead68df94d24 ("KVM: x86: enable -Werror") breaks the build for them.
> 
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:663:12: error: no previous prototype
> for ‘kvm_arch_post_init_vm’ [-Werror=missing-prototypes]
>  int __weak kvm_arch_post_init_vm(struct kvm *kvm)
>             ^~~~~~~~~~~~~~~~~~~~~
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:672:13: error: no previous prototype
> for ‘kvm_arch_pre_destroy_vm’ [-Werror=missing-prototypes]
>  void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)

Thanks, we already found two bugs, one of them real (it's from
-Wtype-limits).  But I'll leave out this commit for now from the pull
request, of course.

Paolo