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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 4D944C43461 for ; Thu, 17 Sep 2020 11:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0317721734 for ; Thu, 17 Sep 2020 11:40:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="L8znAvSC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726919AbgIQLkI (ORCPT ); Thu, 17 Sep 2020 07:40:08 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:24620 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726707AbgIQLgK (ORCPT ); Thu, 17 Sep 2020 07:36:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600342557; 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: in-reply-to:in-reply-to:references:references; bh=5n7wJKyexD2oiZEydGT+/+g5eqfjGOnTvWw7VQtJAzQ=; b=L8znAvSCc4CF9oWcs7z4WspCJmSx7mTnWbDGLK9urFzVGxA8tGw7P2t6hkNoXxdHv2mDd/ f4gUHAKMtSifecut22XQIv6OV12TlGH9pF525wptKFgEEB/iE0jPbsc5/yFeAKahn8s+bb ya2iZMKJCMkTMlwKB1GWzHSR3edO/Zw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-582-dqePwP51NmafVBHYPjGY7g-1; Thu, 17 Sep 2020 07:35:55 -0400 X-MC-Unique: dqePwP51NmafVBHYPjGY7g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C1BC685C731; Thu, 17 Sep 2020 11:35:54 +0000 (UTC) Received: from gondolin (ovpn-113-19.ams2.redhat.com [10.36.113.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id A2662101416C; Thu, 17 Sep 2020 11:35:50 +0000 (UTC) Date: Thu, 17 Sep 2020 13:35:37 +0200 From: Cornelia Huck To: Zenghui Yu Cc: , , , Subject: Re: [PATCH 2/2] vfio/pci: Remove bardirty from vfio_pci_device Message-ID: <20200917133537.17af2ef3.cohuck@redhat.com> In-Reply-To: <20200917033128.872-2-yuzenghui@huawei.com> References: <20200917033128.872-1-yuzenghui@huawei.com> <20200917033128.872-2-yuzenghui@huawei.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 17 Sep 2020 11:31:28 +0800 Zenghui Yu wrote: > It isn't clear what purpose the @bardirty serves. It might be used to avoid > the unnecessary vfio_bar_fixup() invoking on a user-space BAR read, which > is not required when bardirty is unset. > > The variable was introduced in commit 89e1f7d4c66d ("vfio: Add PCI device > driver") but never actually used, so it shouldn't be that important. Remove > it. > > Signed-off-by: Zenghui Yu > --- > drivers/vfio/pci/vfio_pci_config.c | 7 ------- > drivers/vfio/pci/vfio_pci_private.h | 1 - > 2 files changed, 8 deletions(-) Yes, it seems to have been write-only all the time. Reviewed-by: Cornelia Huck