linux-kernel - Re: [PATCH] KVM: x86: fix deadlock for KVM_XEN_EVTCHN

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Message-ID: <CABgObfb6Z2MkG8yYtbObK4bhAD_1s8Q_M=PnP5pF-sk3=w8XDg@mail.gmail.com>
Date:   Thu, 19 Jan 2023 19:00:23 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Yu Zhang <yu.c.zhang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Michal Luczaj <mhal@...x.co>,
        David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH] KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET

On Thu, Jan 19, 2023 at 6:57 PM Sean Christopherson <seanjc@...gle.com> wrote:
> > This change generates a build failure with error message:
> > "error: a label can only be part of a statement and a declaration is not a statement".
>
> And other flavors too, e.g.
>
> x86_64/xen_shinfo_test.c:965:2: error: expected expression
>         struct kvm_xen_hvm_attr evt_reset = {
>         ^
> x86_64/xen_shinfo_test.c:969:38: error: use of undeclared identifier 'evt_reset'
>         vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &evt_reset);
>                                             ^
> x86_64/xen_shinfo_test.c:969:38: error: use of undeclared identifier 'evt_reset'
> 3 errors generated.
> make: *** [../lib.mk:145: tools/testing/selftests/kvm/x86_64/xen_shinfo_test] Error 1
> make: *** Waiting for unfinished jobs....
>
> I'm surprised bots haven't complained about this, haven't seen any reports.

It's clang only; GCC only warns with -Wpedantic. Plus, bots probably
don't compile tools/ that much.

Paolo