From nobody Sat Nov 23 17:58:26 2024 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3A8AB450EE; Mon, 11 Nov 2024 18:39:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731350398; cv=none; b=FKJXqhBIytOrbxQ1QrjbgVgsfFiQ23SgI/yZWuxZ9khWU/qQybiJDHE4MgzJVJ/EkZBQHkY3ZWmsIBbTcLt83tuHaOwMDr2NpNYd84L45rD5iflcQ4PRt0iGcvwO5ZUoVuOgiwAb91EKrYYtFmYhDQH5saLcvRkGpvy7nHIBcyo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731350398; c=relaxed/simple; bh=Mkf8d4ycutLC3OawYLhiBBp12Y3I2OyMomLoWhibygY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=MXJ0sb46uOM7B8/BYfUUsSYRiQB9k981ou8PkEJu9BS3NbNGJCt85DjqVLYxF/+/wDZ6aIRb9yfKthhUWBLTOSHxgfGnsRl3jVWqLwOLVBVtdvVZMc3Yc27QeammzsW93qk3878t1cNLDNsQHZJE27uTtSh6LIcnt+NBS7MdFnk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=QTvSjVLN; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="QTvSjVLN" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-20c805a0753so45913895ad.0; Mon, 11 Nov 2024 10:39:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731350397; x=1731955197; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=is2dX1BvkV4gQvPfSQkwfTIdaReamJ5nfgtDMnPyLNk=; b=QTvSjVLNIng+EH4zzlJGK59jrzQh/qfU4qn4tMlOjZ5K/1ZFem+RNbI6IjBbLqrbcT s2BSVNqEcKaUrk1mpMCTjW4fawbyCWs1ghhL9EW1LcgnQyl+l/KbOQ0YVDyLA35S/Gnu s2UGJEx/2I/mc78hJzY7tKfgTr51Jxv/P7eiujn7rB66sCtY/r7oAi+pO4ij4KWu+wqL DQbULRvi/cGx/7xsKAj5WpIWgFm31oC7dCUR9C6PxyURw/kPVC1yBt1MCravv1z7k9np gE7HUMw8lmNjGTh6POl8dX3yJofKMly/qO8bE00tyhIMQEWVDDmhg6upYm9XPkW41IsR +UGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731350397; x=1731955197; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=is2dX1BvkV4gQvPfSQkwfTIdaReamJ5nfgtDMnPyLNk=; b=FtFjjG8zQonpsZiNYq8/LI6gGeTDh6jlQYCIlqeQQQdIgMdVco/E6tm04R2xKs8iak Pfvgzh76iZquVvdMFvvaj0e3sNDiqlqbWPhxM1+REG8Smsxg70Ms1bNy8gytTVDwu98u bAhVmNKqWHKdlKY3BNfkucPqT/mQFMU0UWv5YNs1a0GHJNgFDzlSAVkQqGcxJ1bgqsbU 7h7eG00XsDZA0U5WNzDr+iV2ME/9+mvYhGJldNQS8GgwjtRqlcnuXgO88xMC4wrUi/K1 k7gTd0nRGuLBm58qtKSW9xP/NMygg+60/Qackf7y5X+negIRg1kt8g9sr/Qgd8lTh26N uKDA== X-Forwarded-Encrypted: i=1; AJvYcCVnM+1T7TNINWPVCDYP4Ca0Q0y/hDOJu3EBUpiq0D/KpZIMOo4UaKZoHdBY/TyRxZLZdrL27yFGtRgt7wI=@vger.kernel.org X-Gm-Message-State: AOJu0Ywl+5apeKteFduWeXjzG0j/PXvyq8/11IxU1KJqMhIPIDYQW+An Cg1zMao5RfIEAsuCHBA8y6bxcBuR2z9NMpoiLKJUaGq8bsWNWoAnC/t0lwys X-Google-Smtp-Source: AGHT+IGEYA+Tlv87Xjls4JLjmwWZezIuJutVxmFPz43mU/MFltEMX24LiSAfLkHDhngqoU4rDwvLtw== X-Received: by 2002:a17:902:f541:b0:20d:1866:ed6f with SMTP id d9443c01a7336-21183ccf11bmr185647305ad.4.1731350396455; Mon, 11 Nov 2024 10:39:56 -0800 (PST) Received: from advait-kdeneon.lan ([2409:40d0:1170:6e90:2801:34a4:f903:135]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21177e4278dsm78621345ad.159.2024.11.11.10.39.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Nov 2024 10:39:55 -0800 (PST) From: Advait Dhamorikar To: Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, hpa@zytor.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, anupnewsmail@gmail.com, Advait Dhamorikar Subject: [PATCH-next] KVM: x86/tdp_mmu: Fix redundant u16 compared to 0 Date: Tue, 12 Nov 2024 00:09:35 +0530 Message-Id: <20241111183935.8550-1-advaitdhamorikar@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" An unsigned value can never be negative, so this test will always evaluate the same way. `_as_id` a u16 is compared to 0. Signed-off-by: Advait Dhamorikar --- arch/x86/kvm/mmu/tdp_mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 4508d868f1cd..b4e7b6a264d6 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -153,7 +153,7 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kv= m *kvm, for (_root =3D tdp_mmu_next_root(_kvm, NULL, _only_valid); \ ({ lockdep_assert_held(&(_kvm)->mmu_lock); }), _root; \ _root =3D tdp_mmu_next_root(_kvm, _root, _only_valid)) \ - if (_as_id >=3D 0 && kvm_mmu_page_as_id(_root) !=3D _as_id) { \ + if (kvm_mmu_page_as_id(_root) !=3D _as_id) { \ } else =20 #define for_each_valid_tdp_mmu_root_yield_safe(_kvm, _root, _as_id) \ --=20 2.34.1