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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4030C43334 for ; Thu, 30 Jun 2022 02:45:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229635AbiF3Cpr (ORCPT ); Wed, 29 Jun 2022 22:45:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbiF3Cpq (ORCPT ); Wed, 29 Jun 2022 22:45:46 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA0DF1A3B0; Wed, 29 Jun 2022 19:45:45 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id k14so15799087plh.4; Wed, 29 Jun 2022 19:45:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=Ev4+82itvCxx5jxqraeA1gGNjalXvR8F+/m9LOFF/5A=; b=K7ZVgdrrsWcy1yjAW3ycsPtDtqN6ywgqVKRuyDKbJyN4Y+NGrTZv2hQ7J0w0bEelNV i+eCFSfRuEweTConB41DSrPNj71Jr2KYkYvx3kOz1Vh4IHopNW6UAc2vNixslsuMm1wJ OeYxQQCqM2Eft2uMNS2MwG+k4IRWeMYJAUAy9eEyPv8mZ0w3NN8KP5IB2ENhcqQ94sIv rUiIyuxefipyrsszHFoboTh8dqAPYl1cE4Dse0F7k86V/JIgmzZ/G/hZB5RypDeEN6h+ UswUdrmueOcQ9kRWPl/svKOtRVP088fpizloWAqZMOmR66bHa8HkQv9a6+5iNTWT706O 7GLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=Ev4+82itvCxx5jxqraeA1gGNjalXvR8F+/m9LOFF/5A=; b=CScifvGkfBTTh++KtnQUvOE1SLl5LxQ+IKWCwMzphBEG3Sg0OYjtwkjfs7UwUc7lyn B8DxPTZm6w7hNNNVX+M6UW+DJVeMflVsAILeZHOSICTMIkpzDXNfrRFUr5x51emJYQBX 2a0FEvKcREh0IZgDoe7V1hzFlromqtO2XuAGC2nUeGCl9CkhpXm72UYy4sc74dpx8gKT TALP1atW8CAH5kkj4hXZppVdXDPRymOCn1bjoJE0gEaa6xwqCck1maj1bbBNHFLX1V33 IlUpz++7yadanbA4+bZNMb6/CZ6QQlBA+Zl8rTjbTdvAG85gYe86OfBWwAO/KR3dUsWB 0dXw== X-Gm-Message-State: AJIora9igtJqCfZhX7NuQaw6xK8lOEU8RhXVAH0sL/o3LZE6q+O9Q3dE oM2BqkAQB5ACJ0UAkzp1WRa8RaFlGjU= X-Google-Smtp-Source: AGRyM1uZctpSZI6Mw0Axkt0tNBlPH3nv0kVLFwsCnDfKmsDu5NDV3VVpX02f6F5zRs7NTPrSgBqayw== X-Received: by 2002:a17:90b:4f8c:b0:1ed:243:ba07 with SMTP id qe12-20020a17090b4f8c00b001ed0243ba07mr9110403pjb.89.1656557145026; Wed, 29 Jun 2022 19:45:45 -0700 (PDT) Received: from [10.1.1.24] (222-155-0-244-adsl.sparkbb.co.nz. [222.155.0.244]) by smtp.gmail.com with ESMTPSA id d4-20020a170902654400b00168aed83c63sm12151164pln.237.2022.06.29.19.45.40 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 29 Jun 2022 19:45:44 -0700 (PDT) Subject: Re: [PATCH v1 0/3] Converting m68k WD33C93 drivers to DMA API To: Arnd Bergmann , Geert Uytterhoeven References: <20220629011638.21783-1-schmitzmic@gmail.com> <5e57e1e1-2b06-e58c-9081-3b2cce11b5ce@gmail.com> Cc: Linux/m68k , linux-scsi From: Michael Schmitz Message-ID: <299b7b79-c8b9-46b8-8ae5-30ebd38e2c2c@gmail.com> Date: Thu, 30 Jun 2022 14:45:38 +1200 User-Agent: Mozilla/5.0 (X11; Linux ppc; rv:45.0) Gecko/20100101 Icedove/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hi Arnd, Am 30.06.2022 um 04:44 schrieb Arnd Bergmann: > For simplicity, the normal bounce buffer could similarly use > dma_alloc_coherent(), which will also result in an uncached > buffer. If I read this correctly, this will also ensure that the buffer No sure we can rule out calling dma_setup() in interrupt context. > is within the DMA mask, so if ZONE_DMA is larger than the mask, > it just returns NULL and you have to fall back to the chipram > page, rather than checking the address and freeing the buffer. Still need to check what ZONE_DMA is set to on Amiga. Cheers, Michael > > Arnd >