linux-kernel - [PATCH v2] KVM: x86: avoid warning with -Wbitwise-instead-of-logical

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Date:   Mon, 18 Oct 2021 14:36:08 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     torvic9@...lbox.org
Subject: [PATCH v2] KVM: x86: avoid warning with -Wbitwise-instead-of-logical

This is a new warning in clang top-of-tree (will be 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 code is fine, but change it anyway to shut up this clever clogs
of a compiler.

Reported-by: torvic9@...lbox.org
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/spte.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h
index 7c0b09461349..66782e796c0a 100644
--- a/arch/x86/kvm/mmu/spte.h
+++ b/arch/x86/kvm/mmu/spte.h
@@ -315,7 +315,7 @@ static __always_inline bool is_rsvd_spte(struct rsvd_bits_validate *rsvd_check,
 	 * bits and EPT's invalid memtype/XWR checks to avoid an extra Jcc
 	 * (this is extremely unlikely to be short-circuited as true).
 	 */
-	return __is_bad_mt_xwr(rsvd_check, spte) |
+	return __is_bad_mt_xwr(rsvd_check, spte) ||
 	       __is_rsvd_bits_set(rsvd_check, spte, level);
 }
 
-- 
2.27.0