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=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 B7093C43613 for ; Thu, 20 Jun 2019 05:25:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8BBE12147A for ; Thu, 20 Jun 2019 05:25:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dYQXMd9p" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726368AbfFTFZb (ORCPT ); Thu, 20 Jun 2019 01:25:31 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:43306 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbfFTFZa (ORCPT ); Thu, 20 Jun 2019 01:25:30 -0400 Received: by mail-pf1-f193.google.com with SMTP id i189so968670pfg.10 for ; Wed, 19 Jun 2019 22:25:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:subject:to:cc:references:in-reply-to:mime-version :user-agent:message-id:content-transfer-encoding; bh=zlU77qurwFBHY4ItXISiY+NZzcjBbiD22X4dtBHNWtU=; b=dYQXMd9pHNzHz6HK2pXYsrRhHBwvsP7wJdPtTqX4UcubHVwuffRExKOkpyrHJ5Qx4W 0hktkH8dgpFWn35KG4U5iMQEvPgXirPaWCN2d5Cy5p8qgIOLY/B/74d+vx15hj0xrrzb 7pwHLsqTe+G6XqRL7WNcQRXZZbZtn7chXkzPPvGIn5U4UfufxM+jI4dsNcixbgL/RLAe 6Vei0LuwvqnqlaRTateNDpYgHiEIkd2FXZhysojioH/5uKAP/YIhOxVu62TyAeU2eiUr JBViTIvys1+cM3VFgaNXViIefNGz6PUDGXU+Mb5WTT+aaNT4RjS5yadFnG0/URWikP8R M6SA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:subject:to:cc:references:in-reply-to :mime-version:user-agent:message-id:content-transfer-encoding; bh=zlU77qurwFBHY4ItXISiY+NZzcjBbiD22X4dtBHNWtU=; b=iGa3c+xarRFL1pdVb8fin8vrOR/ratTuCNo7Dd0ir6tXRt4SISFkcdRLc1NHmpwxwy duuen6bglT8u8XImHD4j1lo1qFZ3CG+fuDbPOg86X/O6Ba8qC2svhErK1D0M1ZBej7Wb wnuuc7sNBXcH7J2JJ3PUlp264h2JFyjPouyW35eOJWCJmq8ckAhVrZNUCF5xdk/O6Rdb G85ve95AOxEe6I6wzqS8jrmZXpAHE4hPH30gmcOOc4vP1C+Lpv2v9d9pK3t4EdjxQuEd j0MZ1mFZAa9Kb/FVI80VAkKizM8X0AacqPqR/yBtEAyQHSsltZgXAMp/dvZcsSPlbhCQ ACcQ== X-Gm-Message-State: APjAAAWUTEud/igT29jZvyoFRbQL8sul3PMlninaibYAofhgYguncn8n sfycNklrq6CqHdDrYzxxzxY= X-Google-Smtp-Source: APXvYqwGlNIh3qGSCHGTDNRkebDfOHC9wPc4sz46s7V/6RQiPr6YS1ATNPfWQ2H4D+vJDveyDEuVjQ== X-Received: by 2002:a63:c44f:: with SMTP id m15mr11085798pgg.34.1561008330349; Wed, 19 Jun 2019 22:25:30 -0700 (PDT) Received: from localhost (193-116-72-140.tpgi.com.au. [193.116.72.140]) by smtp.gmail.com with ESMTPSA id s24sm20437852pfh.133.2019.06.19.22.25.29 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 19 Jun 2019 22:25:29 -0700 (PDT) Date: Thu, 20 Jun 2019 15:25:38 +1000 From: Nicholas Piggin Subject: Re: [PATCH v2] ocxl: Allow contexts to be attached with a NULL mm To: Alastair D'Silva , alastair@d-silva.org Cc: Andrew Donnellan , Andrew Morton , Arnd Bergmann , Benjamin Herrenschmidt , Frederic Barrat , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Michael Ellerman , Paul Mackerras , Suraj Jitindar Singh , Thomas Gleixner , Masahiro Yamada References: <20190620041203.12274-1-alastair@au1.ibm.com> In-Reply-To: <20190620041203.12274-1-alastair@au1.ibm.com> MIME-Version: 1.0 User-Agent: astroid/0.14.0 (https://github.com/astroidmail/astroid) Message-Id: <1561008239.9nxgz9ee3u.astroid@bobo.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Alastair D'Silva's on June 20, 2019 2:12 pm: > From: Alastair D'Silva >=20 > If an OpenCAPI context is to be used directly by a kernel driver, there > may not be a suitable mm to use. >=20 > The patch makes the mm parameter to ocxl_context_attach optional. >=20 > Signed-off-by: Alastair D'Silva Yeah I don't think you need to manage a kernel context explicitly because it will always be flushed with tlbie, comment helps. For the powerpc/mm bit, Acked-by: Nicholas Piggin =