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=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 4C2B0C43470 for ; Thu, 8 Apr 2021 11:02:37 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DB1E561130 for ; Thu, 8 Apr 2021 11:02:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DB1E561130 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:Subject: From:References:Cc:To:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=NWpfJoShGfE5IG9FNgfSe5X9LqzV2Jq2C1tgsFbvC3A=; b=YPH6vxEiDZiSTkiEkbYOEXZR5 3Ox//DFjJGqB0JiOBpWbFPHlEuXpp6JYeHk5k7KLYW7m+OgticUQDsc9CA/nLaehVG+e2PI0hkeCn pFMo4Ye9K7t4b/5GzlwxlITGAK9uspEbSfXrBsah6qNUooY7nb3h14hOqIr/7mG211Mfyp2XbKOWQ xcTAU4Zk6AGVjg4K8ESwZAljAIJkNBzR8p+gXfWQo8CQ4p/7N/wIXIZYV/Bjv+JTo/BpQ+iJRKVK2 hxnCU2ZQVvyD8pKamQliShgjqP3ewDfLXnwMho/Vouimvc6jFCRQ0uDOAidkLqvBnmHOSut+B4t/Q gZiAO+gHg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lUSPI-007jKQ-Ss; Thu, 08 Apr 2021 11:01:04 +0000 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lUSPE-007jIz-6o for linux-arm-kernel@lists.infradead.org; Thu, 08 Apr 2021 11:01:02 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617879659; 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=WQhqnjeZkCOh2eK1FDK8AD+p6DMcS/hFEdzGcfPMAFo=; b=DECzzvGWJEToG8T3g3tjqnd5s6HUXe4uixcuYIkMXdLbNOUNTl3r7cJfztnTP2xiep5N5u t9aYhJuiBJNYbLftgGXY/MhlJNYV91vx/2a8xJfRamnsiWWH/0/1VjQDlS9VC6ObWWduyR /Z8jIu4qr+h4CaDyrQNzkh+5kXi4Ays= 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-546-cf3ok8EPM6mmTtU9zSKjug-1; Thu, 08 Apr 2021 07:00:57 -0400 X-MC-Unique: cf3ok8EPM6mmTtU9zSKjug-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4E56F83DD21; Thu, 8 Apr 2021 11:00:54 +0000 (UTC) Received: from [10.36.114.231] (ovpn-114-231.ams2.redhat.com [10.36.114.231]) by smtp.corp.redhat.com (Postfix) with ESMTP id EF0CA5D9D0; Thu, 8 Apr 2021 11:00:48 +0000 (UTC) To: Arnd Bergmann Cc: Linux Kernel Mailing List , Linux-MM , Joel Stanley , David Airlie , Daniel Vetter , Andrew Jeffery , Lucas Stach , Russell King , Christian Gmeiner , Mike Rapoport , Bartlomiej Zolnierkiewicz , Linus Walleij , Michal Simek , Masahiro Yamada , Randy Dunlap , Peter Collingbourne , linux-aspeed , dri-devel , Linux ARM , The etnaviv authors , Linux Fbdev development list References: <20210408092011.52763-1-david@redhat.com> <20210408092011.52763-3-david@redhat.com> From: David Hildenbrand Organization: Red Hat GmbH Subject: Re: [PATCH v1 2/2] drivers/gpu/drm: don't select DMA_CMA or CMA from aspeed or etnaviv Message-ID: <7496ac87-9676-1b4e-3444-c2a662ec376b@redhat.com> Date: Thu, 8 Apr 2021 13:00:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210408_120100_472101_E9077BB1 X-CRM114-Status: GOOD ( 26.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org >>> In particular, it does not prevent a configuration with 'DRM_CMA=m' >> >> I assume you meant "DRM_CMA=n" ? DRM_CMA cannot be built as a module. > > Ok, at least that makes it easier. > >>> and 'DRMA_ASPEED_GFX=y', or any build failures from such >>> a configuration. >> >> I don't follow. "DRM_CMA=n" and 'DRMA_ASPEED_GFX=y' is supposed to work >> just fine (e.g., without HAVE_DMA_CONTIGUOUS) or what am I missing? > > I thought you were trying to solve the problem where DRMA_ASPEED_GFX > can optionally link against CMA but would fail to build when the CMA code > is in a loadable module. Yes. I was trying to say: it works with this patch just fine. The issue you described does not seem to apply (DRM_CMA=m). > >> Your example looks more like a NOP - no? >> Or will it have the same effect? > > The example I gave is only meaningful if both are tristate, which is > not the case here as you explain. Okay, thanks. > > It is a somewhat awkward way to say "prevent this symbol from > being =y if the dependency is =m". What would be the right thing to do in the case here then to achieve the "if DRMA_ASPEED_GFX is enabled, also enable DMA_CMA id possible"? One approach could be to have for DMA_CMA default y if DRMA_ASPEED_GFX but it feels like the wrong way to tackle this. Thanks! -- Thanks, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel