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([2001:b07:6468:f312:e4f4:3c00:2b79:d6dc]) by smtp.gmail.com with ESMTPSA id h18sm2550204wmm.34.2020.03.25.09.26.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Mar 2020 09:26:21 -0700 (PDT) Subject: Re: linux-next: Tree for Mar 25 (arch/x86/kvm/) To: Sean Christopherson Cc: Randy Dunlap , Stephen Rothwell , Linux Next Mailing List , Linux Kernel Mailing List , KVM , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel References: <20200325195350.7300fee9@canb.auug.org.au> <064720eb-2147-1b92-7a62-f89d6380f40a@infradead.org> <85430f7e-93e0-3652-0705-9cf6e948a9d8@redhat.com> <20200325161405.GG14294@linux.intel.com> From: Paolo Bonzini Message-ID: <7b71119b-4594-2535-24ba-2c59430e4f30@redhat.com> Date: Wed, 25 Mar 2020 17:26:20 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200325161405.GG14294@linux.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/03/20 17:14, Sean Christopherson wrote: >> Doh, right. I think the only solution for that one is to degrade it to >> WARN_ON(1). > I reproduced the error, give me a bit to play with the code to see if the > BUILD_BUG can be preserved. I'm curious as to why kvm_cpu_cap_mask() is > special, and why it only fails with this config. > I could not reproduce it, but I would not be surprised if there are other configurations where the compiler cannot constant-propagate from the reverse_cpuid struct into __cpuid_entry_get_reg. Paolo