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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 0F642C3A59E for ; Fri, 16 Aug 2019 21:01:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A021C2133F for ; Fri, 16 Aug 2019 21:01:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="VlfOwai9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A021C2133F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0B1286B0008; Fri, 16 Aug 2019 17:01:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0383B6B000A; Fri, 16 Aug 2019 17:01:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E424F6B000C; Fri, 16 Aug 2019 17:01:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0004.hostedemail.com [216.40.44.4]) by kanga.kvack.org (Postfix) with ESMTP id BDFEA6B0008 for ; Fri, 16 Aug 2019 17:01:00 -0400 (EDT) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 581D3181AC9BF for ; Fri, 16 Aug 2019 21:01:00 +0000 (UTC) X-FDA: 75829510680.07.clock59_25d3cde610f07 X-HE-Tag: clock59_25d3cde610f07 X-Filterd-Recvd-Size: 2235 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf21.hostedemail.com (Postfix) with ESMTP for ; Fri, 16 Aug 2019 21:00:59 +0000 (UTC) Received: from localhost.localdomain (c-73-223-200-170.hsd1.ca.comcast.net [73.223.200.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 63B872133F; Fri, 16 Aug 2019 21:00:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565989258; bh=KfBZ36B394sYe7mkkVCgZdVU+aXcwatWWBVhiPlhweY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=VlfOwai9UGWDt96zOxfmiJOjMKL4/lmTbJ7PqIEIxnyMIOfLWuddL1N3iELB68ZwV 49+0YjcPaM+mIQShOMVbqE8qsPT2r00wphg3FQZt2qwvyLZ/Yx6Q/DttOKk3Qqky2X fWUsSZZOIVwzkbcSzs9cbFq2jWb0fV/fhH1SNQ88= Date: Fri, 16 Aug 2019 14:00:57 -0700 From: Andrew Morton To: Christoph Hellwig Cc: Dan Williams , Jason Gunthorpe , Bharata B Rao , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Subject: Re: [PATCH 4/4] memremap: provide a not device managed memremap_pages Message-Id: <20190816140057.c1ab8b41b9bfff65b7ea83ba@linux-foundation.org> In-Reply-To: <20190816065434.2129-5-hch@lst.de> References: <20190816065434.2129-1-hch@lst.de> <20190816065434.2129-5-hch@lst.de> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 16 Aug 2019 08:54:34 +0200 Christoph Hellwig wrote: > The kvmppc ultravisor code wants a device private memory pool that is > system wide and not attached to a device. Instead of faking up one > provide a low-level memremap_pages for it. Note that this function is > not exported, and doesn't have a cleanup routine associated with it to > discourage use from more driver like users. Confused. Which function is "not exported"? > +EXPORT_SYMBOL_GPL(memunmap_pages); > +EXPORT_SYMBOL_GPL(memremap_pages); > EXPORT_SYMBOL_GPL(devm_memremap_pages);