linux-kernel - [PATCH 5.10 01/21] KVM: x86: avoid warning with -Wbitwise-instead-of-logical

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Date:   Wed, 10 Nov 2021 19:43:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, torvic9@...lbox.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 5.10 01/21] KVM: x86: avoid warning with -Wbitwise-instead-of-logical

From: Paolo Bonzini <pbonzini@...hat.com>

commit 3d5e7a28b1ea2d603dea478e58e37ce75b9597ab upstream.

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>
[nathan: Backport to 5.10, which does not have 961f84457cd4]
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/mmu/mmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3545,7 +3545,7 @@ static bool get_mmio_spte(struct kvm_vcp
 		 * reserved bit and EPT's invalid memtype/XWR checks to avoid
 		 * adding a Jcc in the loop.
 		 */
-		reserved |= __is_bad_mt_xwr(rsvd_check, sptes[level - 1]) |
+		reserved |= __is_bad_mt_xwr(rsvd_check, sptes[level - 1]) ||
 			    __is_rsvd_bits_set(rsvd_check, sptes[level - 1],
 					       level);
 	}