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 CEC96C433EF for ; Wed, 8 Jun 2022 17:29:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230339AbiFHR3R (ORCPT ); Wed, 8 Jun 2022 13:29:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232728AbiFHR2U (ORCPT ); Wed, 8 Jun 2022 13:28:20 -0400 Received: from mail-pl1-f179.google.com (mail-pl1-f179.google.com [209.85.214.179]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DA9D275CA; Wed, 8 Jun 2022 10:28:04 -0700 (PDT) Received: by mail-pl1-f179.google.com with SMTP id d22so18200259plr.9; Wed, 08 Jun 2022 10:28:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=dpHSA3kj0eHHqdYze/RCpBE0tw7cvZjVvQOy/DfoJ2s=; b=Guv1VNHFN+Ce4NfvlvvjCl8Vqnee7V9IlJyIuo0hpl03uOIJXLYGICZN7c9+/YD2gF u0QYLZTkqttAyGbzIsvUud3oyvRsMcse9DMqTqyjKnWRIZX13kjfXBxpMXy0o5NkG3GH FTCjkg8Y7LKwi6rooY2NGHPlp+OKx4Qy7ifa4BYexg35kC8r0PkCpURocSHW7rvMyop4 jj0zSpThIEgKjBAd+TAAuPuJXvfRyLpvbP+B3qh7Iy+ifOoffGGcJz0dFnfRYBZglXfm 70r9p0S1enNuWTgxrrOX8eZMaX6GnprqeDJ8Xe+YviMDIRXxVXESDh+HTME/Qes8ekW/ hE4Q== X-Gm-Message-State: AOAM530C+tw3h+YkaGdb+/hUAvtePOtzS+sgpgbR2SUNLvydA5aDnPD7 DBHPkdoGlW9HNRYVuALHysg= X-Google-Smtp-Source: ABdhPJzMDpvgYrNyCdrUrf5LIBVmTVoNnNeogBR/uNjDb79MyeVN9aegG63yruaNNjBQ7ETB9eku5Q== X-Received: by 2002:a17:90b:3a87:b0:1e8:8079:b7e6 with SMTP id om7-20020a17090b3a8700b001e88079b7e6mr247147pjb.139.1654709283698; Wed, 08 Jun 2022 10:28:03 -0700 (PDT) Received: from ?IPV6:2620:15c:211:201:1cb7:9e5d:5ca4:2a39? ([2620:15c:211:201:1cb7:9e5d:5ca4:2a39]) by smtp.gmail.com with ESMTPSA id m19-20020a170902c45300b00162496617b9sm6030401plm.286.2022.06.08.10.28.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Jun 2022 10:28:02 -0700 (PDT) Message-ID: <543345ac-fbfa-1020-b6c7-72f65412f444@acm.org> Date: Wed, 8 Jun 2022 10:27:59 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH v3 1/4] dma-mapping: Add dma_opt_mapping_size() Content-Language: en-US To: John Garry , damien.lemoal@opensource.wdc.com, joro@8bytes.org, will@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, iommu@lists.linux-foundation.org, linux-scsi@vger.kernel.org, liyihang6@hisilicon.com, chenxiang66@hisilicon.com, thunder.leizhen@huawei.com References: <1654507822-168026-1-git-send-email-john.garry@huawei.com> <1654507822-168026-2-git-send-email-john.garry@huawei.com> From: Bart Van Assche In-Reply-To: <1654507822-168026-2-git-send-email-john.garry@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 6/6/22 02:30, John Garry wrote: > +:: > + > + size_t > + dma_opt_mapping_size(struct device *dev); > + > +Returns the maximum optimal size of a mapping for the device. Mapping large > +buffers may take longer so device drivers are advised to limit total DMA > +streaming mappings length to the returned value. "Maximum optimal" sounds weird to me. Is there a single optimal value or are there multiple optimal values? In the former case I think that the word "maximum" should be left out. Thanks, Bart.