From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,SUBJECT_DIET,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2A8EC433FE for ; Sun, 13 Dec 2020 03:49:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 946C9207B2 for ; Sun, 13 Dec 2020 03:49:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393212AbgLMDtV (ORCPT ); Sat, 12 Dec 2020 22:49:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726903AbgLMDtV (ORCPT ); Sat, 12 Dec 2020 22:49:21 -0500 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 340BAC0613CF; Sat, 12 Dec 2020 19:48:41 -0800 (PST) Received: by mail-pj1-x1042.google.com with SMTP id b5so4642983pjl.0; Sat, 12 Dec 2020 19:48:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/rkSHMlojCXH5HcNeMma4J+v/xy53IB23f7w2LPElmU=; b=EVNwfV5I90T9E5wxQytNgAQmw7uPec5es98+pvxsGjnTW7S/iPGeOo7aZMQAiZgHIt 06YF0qpahKC/XxyUyA2bAS5k3o8V+hGGJ0FOK7UiuRCgcYPx2nlSnlQkx4+uj02rQdm5 ibe1hUqytfRSIJ1NNKOD6SYITKDvGTbhqwtE0V+lxJPNoFyxkDhZGmV4wrneRZP67MGG /Q2GMASPZP55Kyz9a//iZpioORq3UaWF3bOYCZOrDzyxjsreOsAaJujfh6DMSkrVppD+ TsApegmtJ1fCor7/11dN8syHiw9l24OWA3UyTaMkAgf2MySxKTB3lUAorY+KxMzI4KD+ zOLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/rkSHMlojCXH5HcNeMma4J+v/xy53IB23f7w2LPElmU=; b=ICiI69eHIGOyWbreYBCH2tEY1uV7N5U2aKuNBSkkBUxa3dHwiOKKZ8Aar5txyxtO9N c/Xew16PMghix3HCK0iifHk7JSSLQApuYa2Shv9+2x19XbWG1I59vc8DnhNxJ03voVnL oY/b71fGQW0Iv5fHK8ZAB43Hv/4+acSRMI0QKORFDNK2QTUytqz7YTV06rZpPifeQ5tA aTipc0AxiP2+kya5ePTNif+6PTOd3HyANSe+FOGKMqp58Zk6QrW8FB/0YJjUol9naH8L xJ/S0sI+26EcQbLvz/RYe/wE5ZkCfNSBy7LuFsz7+Er0f/pxBJiJiuKkmNqwwHlVFXFE v1SA== X-Gm-Message-State: AOAM533O7alzxh365cS9q9ruQHUJVBpFh2swxUR3qHJhZNE53JQlyfLh SMTqfUkgjNCcvDwiaGGt0D+pipM6r0rr/g== X-Google-Smtp-Source: ABdhPJzzvPl38bay+gvAQcb3Ia9CmxQMfSPrl4F4mwZpCo0Vpc70AhI6Oj5UailreqoqW9vokCifFQ== X-Received: by 2002:a17:902:8f82:b029:da:f37f:79bf with SMTP id z2-20020a1709028f82b02900daf37f79bfmr17520254plo.79.1607831320510; Sat, 12 Dec 2020 19:48:40 -0800 (PST) Received: from localhost ([47.88.5.130]) by smtp.gmail.com with ESMTPSA id l141sm16887356pfd.124.2020.12.12.19.48.39 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 12 Dec 2020 19:48:40 -0800 (PST) From: Lai Jiangshan To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Lai Jiangshan , Paolo Bonzini Subject: [PATCH] kvm: don't lose the higher 32 bits of tlbs_dirty Date: Sun, 13 Dec 2020 12:49:13 +0800 Message-Id: <20201213044913.15137-1-jiangshanlai@gmail.com> X-Mailer: git-send-email 2.19.1.6.gb485710b MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lai Jiangshan In kvm_mmu_notifier_invalidate_range_start(), tlbs_dirty is used as: need_tlb_flush |= kvm->tlbs_dirty; with need_tlb_flush's type being int and tlbs_dirty's type being long. It means that tlbs_dirty is always used as int and the higher 32 bits is useless. We can just change need_tlb_flush's type to long to make full use of tlbs_dirty. Signed-off-by: Lai Jiangshan --- virt/kvm/kvm_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 2541a17ff1c4..4e519a517e9f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -470,7 +470,8 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, const struct mmu_notifier_range *range) { struct kvm *kvm = mmu_notifier_to_kvm(mn); - int need_tlb_flush = 0, idx; + long need_tlb_flush = 0; + int idx; idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); -- 2.19.1.6.gb485710b