From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, llvm@lists.linux.dev,
linux-kernel@vger.kernel.org, Like Xu <like.xu.linux@gmail.com>
Subject: Re: [PATCH] KVM: x86: Fix pointer mistmatch warning when patching RET0 static calls
Date: Thu, 24 Feb 2022 15:23:12 +0100 [thread overview]
Message-ID: <4ce5ed1c-78e5-8150-65cd-288f1023c7a0@redhat.com> (raw)
In-Reply-To: <20220223162355.3174907-1-seanjc@google.com>
On 2/23/22 17:23, Sean Christopherson wrote:
> Cast kvm_x86_ops.func to 'void *' when updating KVM static calls that are
> conditionally patched to __static_call_return0(). clang complains about
> using mismatching pointers in the ternary operator, which breaks the
> build when compiling with CONFIG_KVM_WERROR=y.
>
> >> arch/x86/include/asm/kvm-x86-ops.h:82:1: warning: pointer type mismatch
> ('bool (*)(struct kvm_vcpu *)' and 'void *') [-Wpointer-type-mismatch]
>
> Fixes: 5be2226f417d ("KVM: x86: allow defining return-0 static calls")
> Reported-by: Like Xu <like.xu.linux@gmail.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> arch/x86/include/asm/kvm_host.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 713e08f62385..f285ddb8b66b 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1547,8 +1547,8 @@ static inline void kvm_ops_static_call_update(void)
> WARN_ON(!kvm_x86_ops.func); __KVM_X86_OP(func)
> #define KVM_X86_OP_OPTIONAL __KVM_X86_OP
> #define KVM_X86_OP_OPTIONAL_RET0(func) \
> - static_call_update(kvm_x86_##func, kvm_x86_ops.func ? : \
> - (void *) __static_call_return0);
> + static_call_update(kvm_x86_##func, (void *)kvm_x86_ops.func ? : \
> + (void *)__static_call_return0);
> #include <asm/kvm-x86-ops.h>
> #undef __KVM_X86_OP
> }
>
> base-commit: f4bc051fc91ab9f1d5225d94e52d369ef58bec58
Queued, thanks.
Paolo
prev parent reply other threads:[~2022-02-24 14:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 16:23 [PATCH] KVM: x86: Fix pointer mistmatch warning when patching RET0 static calls Sean Christopherson
2022-02-23 17:27 ` Nathan Chancellor
2022-02-23 17:59 ` Sean Christopherson
2022-02-23 18:13 ` Nathan Chancellor
2022-02-23 18:56 ` Sean Christopherson
2022-02-23 22:23 ` David Dunn
2022-02-24 14:23 ` Paolo Bonzini [this message]
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