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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 0C084C3A5A9 for ; Mon, 4 May 2020 19:05:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DEEE3206C0 for ; Mon, 4 May 2020 19:05:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RNKVBW/k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727971AbgEDTFe (ORCPT ); Mon, 4 May 2020 15:05:34 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:41800 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726469AbgEDTFc (ORCPT ); Mon, 4 May 2020 15:05:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588619131; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=qIVg0JQeyCu7kn+dY+lPaTgPQT/NdBxPgGWYbUJIIXA=; b=RNKVBW/kf7N18LPuDJNpGkbK9WE5VtNg0xVlxj1q4mBz8Z2Wwy39VN83wxFqrrwh0omSZ+ +lX7zlbBu6BogIXPURUhAtkGJ42z5lfG0DO7TA7Vml21aMeDDRxoJFpOmN/OGgCIBMV3LW LErSltT83vlvN/kmg1Fu9Iu4abS1L8Y= Received: from mail-qk1-f199.google.com (mail-qk1-f199.google.com [209.85.222.199]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-11-V6PG8ecQOqGs8JRyPorgbQ-1; Mon, 04 May 2020 15:05:29 -0400 X-MC-Unique: V6PG8ecQOqGs8JRyPorgbQ-1 Received: by mail-qk1-f199.google.com with SMTP id i2so356809qkl.5 for ; Mon, 04 May 2020 12:05:29 -0700 (PDT) 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=qIVg0JQeyCu7kn+dY+lPaTgPQT/NdBxPgGWYbUJIIXA=; b=V7m/KfAmV02Y4I0h9/O13AJKWvWrT2pd3YXDUu7Z9r4s0LDVc2Xe6K7nSJjKLd0VbQ hUv/AxWk9CO5+jJKPyMFasvkuDwYVaIWA3RzOb111Umpu/GrIq4Iv2NhWGGS8B0rdVah 4BEJIO4QN/rnanGKxdAS9jzCDEWKsX+ufesUWZ9kbmXKkrjVpRM86maYBgTmJ8rEQUH8 RDIuPoFop66bsq75wiXEiA2QJbwpVasqneB0l9aoyzxXtlZDjfibR9ytqr8juSjHvDbQ 8y++KAoBiqmfnjuJ8MWlB1A4tMOejltyXlj8MmbGKr2DP7J//Dcn74r6R1uGcFksffp1 5aOQ== X-Gm-Message-State: AGi0PubNvnYOzJrNdPc/EEU2o9Z8dz26VvB3nkbVb0e5G02lGXeuu7H/ U5j/ymCe5+Xl6U02IohLk6FhnaTfH/BrLsJXLlEtrOGoL3eL6Rpza6CPi9BAlGcA/XeZtvl0qcG viqZJgAmDdmGUF5BYWGT8nXSm X-Received: by 2002:ac8:44d6:: with SMTP id b22mr640165qto.366.1588619128934; Mon, 04 May 2020 12:05:28 -0700 (PDT) X-Google-Smtp-Source: APiQypICFt1DWmxwrFZqvsi6oraH8Ztk1a0hOa6r+UUKVpePo5HU+yUDiugMPSKG00KJ7y+T26omxQ== X-Received: by 2002:ac8:44d6:: with SMTP id b22mr640146qto.366.1588619128682; Mon, 04 May 2020 12:05:28 -0700 (PDT) Received: from xz-x1.redhat.com ([2607:9880:19c0:32::2]) by smtp.gmail.com with ESMTPSA id p22sm12111549qte.2.2020.05.04.12.05.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 May 2020 12:05:27 -0700 (PDT) From: Peter Xu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paolo Bonzini , peterx@redhat.com Subject: [PATCH] KVM: Fix a warning in __kvm_gfn_to_hva_cache_init() Date: Mon, 4 May 2020 15:05:26 -0400 Message-Id: <20200504190526.84456-1-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org GCC 10.0.1 gives me this warning when building KVM: warning: ‘nr_pages_avail’ may be used uninitialized in this function [-Wmaybe-uninitialized] 2442 | for ( ; start_gfn <= end_gfn; start_gfn += nr_pages_avail) { It should not happen, but silent it. Signed-off-by: Peter Xu --- virt/kvm/kvm_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 74bdb7bf3295..2da293885a67 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2425,7 +2425,7 @@ static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, gfn_t start_gfn = gpa >> PAGE_SHIFT; gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; gfn_t nr_pages_needed = end_gfn - start_gfn + 1; - gfn_t nr_pages_avail; + gfn_t nr_pages_avail = 0; /* Update ghc->generation before performing any error checks. */ ghc->generation = slots->generation; -- 2.26.2