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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 983C6C04AAF for ; Mon, 20 May 2019 14:55:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D61C216B7 for ; Mon, 20 May 2019 14:55:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="SfuQsulH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392104AbfETOzq (ORCPT ); Mon, 20 May 2019 10:55:46 -0400 Received: from mail-it1-f194.google.com ([209.85.166.194]:40333 "EHLO mail-it1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731455AbfETOzo (ORCPT ); Mon, 20 May 2019 10:55:44 -0400 Received: by mail-it1-f194.google.com with SMTP id h11so1953286itf.5 for ; Mon, 20 May 2019 07:55:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=RO2OZsOswAnqzoxA5Kah+EcYVhjoBdIBVPEusFbAhx8=; b=SfuQsulHoheqPTiq+0yTaNEt6guPJO5vtoQAXZ8LFw7P5630C1hIePmqANhr78VgMz RXSgnIKX2w8wiNOA/r9VFOqCc2Bu1XJgujekBCCPYO8DEGs9IgKhUShhiGa35tM5iRbv Erm4439OmvyMIxlRQC9PYG5xziVp7JdQLUV4lGvTvJQ0mxig80VdDtTk9S4xZwvzUNCf 5WjA/xsgN/AOhR9o9mJ40COdjTaQ+BEUTmiX+7fgYwPlV2JAH4b9Gqmato1oXiIvxhXZ jbJvRkQznSjlmwf4Uet0FUmNaYSWMfiGDgxxC/4R4H5E+jLoU+c7/yBb/CvEyvbvMrqH uffA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=RO2OZsOswAnqzoxA5Kah+EcYVhjoBdIBVPEusFbAhx8=; b=W+5Jk0Y/uRNiylX5qV5Zbv3tj1M/GU38rlNOXCXKCoI4nc2Tukxhl0SLwDH7nBn92H 8ZEQHszZdooJlfFKXFxVtFh0hO60qh+T21+lcRUkR+s1rfEpSMX09X5O/4yCHgXwQsBr N11roEIRxIWxI355qPEviO8fT2hKw1Ux8/IDAsEihYSKNgvjUQTFCStalA9VwO6tv6DX /0M3A4caYGNwKHJEQzv1O1/h3LH2JklDkLXBuKhrr35dJ9lzt7JEuvxDLR3AB+2WuTQ4 2dTr5Mf6nsHfQGVctrn2hP+kZasa/aUQ+p0gDnDWxgCa2Hj0swPeZldoIQYPwk5iR2Ux fEdQ== X-Gm-Message-State: APjAAAV4CJOWbA8APX7ORD6qRauOd1XUs4/R9IZtq1eFJmKetg5I+ClT 8wawnStTe2kmlq2tJUmk/jgzYQ== X-Google-Smtp-Source: APXvYqypeJLt6TpwEDU4qmkzd+WMK3Vx9kRrxD1fX0sLQmNDlYJDgW7Ki0ExxXNjnH0JE6d2Z1Sq0A== X-Received: by 2002:a24:4c4e:: with SMTP id a75mr29422291itb.42.1558364143993; Mon, 20 May 2019 07:55:43 -0700 (PDT) Received: from [172.22.22.26] (c-71-195-29-92.hsd1.mn.comcast.net. [71.195.29.92]) by smtp.googlemail.com with ESMTPSA id 69sm4206643itl.7.2019.05.20.07.55.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 May 2019 07:55:43 -0700 (PDT) Subject: Re: [PATCH 12/18] soc: qcom: ipa: immediate commands To: Arnd Bergmann Cc: David Miller , Bjorn Andersson , Ilias Apalodimas , syadagir@codeaurora.org, mjavid@codeaurora.org, evgreen@chromium.org, Ben Chan , Eric Caruso , abhishek.esse@gmail.com, Linux Kernel Mailing List , Christoph Hellwig References: <20190512012508.10608-1-elder@linaro.org> <20190512012508.10608-13-elder@linaro.org> <5d948d74-f739-0cfa-8fae-b15c20fbe7ec@linaro.org> From: Alex Elder Message-ID: Date: Mon, 20 May 2019 09:55:42 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/20/19 9:50 AM, Arnd Bergmann wrote: > Ok, that sounds reasonable, yes. I'm not sure if > dma_alloc_coherent() guarantees zero-initialization > though, so if that is required, you may have to > add a memset(). I had dma_zalloc_coherent() originally but I think Christoph Hellwig posted something recently that removed that function, because dma_alloc_coherent() always zeroes the underlying memory. +Christoph, who might be able to explain or confirm -Alex