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From: torvic9@mailbox.org
To: Paolo Bonzini <pbonzini@redhat.com>,
	"seanjc@google.com" <seanjc@google.com>,
	"vkuznets@redhat.com" <vkuznets@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"ndesaulniers@google.com" <ndesaulniers@google.com>,
	"nathan@kernel.org" <nathan@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"bp@alien8.de" <bp@alien8.de>
Subject: Re: [BUG] [5.15] Compilation error in arch/x86/kvm/mmu/spte.h with clang-14
Date: Mon, 4 Oct 2021 11:30:38 +0200 (CEST)	[thread overview]
Message-ID: <936688112.157288.1633339838738@office.mailbox.org> (raw)
In-Reply-To: <b6abc5a3-39ea-b463-9df5-f50bdcb16d08@redhat.com>


> Paolo Bonzini <pbonzini@redhat.com> hat am 04.10.2021 11:26 geschrieben:
> 
>  
> On 04/10/21 11:08, torvic9@mailbox.org wrote:
> > I encounter the following issue when compiling 5.15-rc4 with clang-14:
> > 
> > In file included from arch/x86/kvm/mmu/mmu.c:27:
> > arch/x86/kvm/mmu/spte.h:318:9: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
> >          return __is_bad_mt_xwr(rsvd_check, spte) |
> >                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >                                                   ||
> > arch/x86/kvm/mmu/spte.h:318:9: note: cast one or both operands to int to silence this warning
> 
> The warning is wrong, as mentioned in the line right above:

So it's an issue with clang-14 then?
(I add Nick and Nathan)

> 
>          /*
>           * Use a bitwise-OR instead of a logical-OR to aggregate the reserved
>           * bits and EPT's invalid memtype/XWR checks to avoid an extra Jcc
>           * (this is extremely unlikely to be short-circuited as true).
>           */
> 
> Paolo

  reply	other threads:[~2021-10-04  9:30 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-04  9:08 [BUG] [5.15] Compilation error in arch/x86/kvm/mmu/spte.h with clang-14 torvic9
2021-10-04  9:26 ` Paolo Bonzini
2021-10-04  9:30   ` torvic9 [this message]
2021-10-04  9:49     ` Paolo Bonzini
2021-10-04 10:10       ` torvic9
2021-10-04 14:33         ` torvic9
2021-10-04 16:13       ` Nick Desaulniers
2021-10-04 17:12         ` Jim Mattson
2021-10-14 17:50           ` Nathan Chancellor
2021-10-14 18:31             ` Sean Christopherson
2021-10-14 19:06               ` Nick Desaulniers
2021-10-14 20:50                 ` Paolo Bonzini
2021-10-15  9:17                   ` Christophe de Dinechin

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