linux-kernel - Re: [PATCH] selftests: kvm: move declaration at the beginning of main()

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Date:   Mon, 23 Jan 2023 08:27:44 -0800
From:   David Matlack <dmatlack@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH] selftests: kvm: move declaration at the beginning of main()

On Sun, Jan 22, 2023 at 1:09 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> Placing a declaration of evt_reset is pedantically invalid
> according to the C standard.  While GCC does not really care
> and only warns with -Wpedantic, clang ignores the declaration
> altogether with an error:
>
> 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);
>                                             ^
>
> Reported-by: Yu Zhang <yu.c.zhang@...ux.intel.com>
> Reported-by: Sean Christopherson <seanjc@...gle.com>
> Fixes: a79b53aaaab5 ("KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET", 2022-12-28)
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Thanks, I had a similar patch queued up to send out today :)

Can you add clang to your workflow for queueing patches? It's not the
first time a selftest patch that does not build with clang has snuck
into kvm/queue or even an rc [1].

[1] git log --oneline --grep Fixes: --grep clang --all-match
tools/testing/selftests/kvm