From patchwork Mon Jul 9 08:05:53 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: john.hubbard@gmail.com X-Patchwork-Id: 10513831 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6C3036032A for ; Mon, 9 Jul 2018 08:06:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5B8E2289F0 for ; Mon, 9 Jul 2018 08:06:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4EEA028A54; Mon, 9 Jul 2018 08:06:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E28BF289F0 for ; Mon, 9 Jul 2018 08:06:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 718F26B027D; Mon, 9 Jul 2018 04:06:35 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6CACB6B027E; Mon, 9 Jul 2018 04:06:35 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E3216B027F; Mon, 9 Jul 2018 04:06:35 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-yb0-f197.google.com (mail-yb0-f197.google.com [209.85.213.197]) by kanga.kvack.org (Postfix) with ESMTP id 2884F6B027D for ; Mon, 9 Jul 2018 04:06:35 -0400 (EDT) Received: by mail-yb0-f197.google.com with SMTP id d4-v6so5515570ybl.3 for ; Mon, 09 Jul 2018 01:06:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:dkim-signature:from:to:cc:subject:date :message-id:in-reply-to:references; bh=7S1uPsIr5ADBgcsgfQb4AMK/6T1OOwRBEXslU8sjZiY=; b=HED1AVH6IS2lX27ugfpkYpC2vd81UjSpl6YWm/C1t6P1BglsxwATG0TIZ07o6DXfvj FwbeqOo4VJRUP2pB8g37Na4AmzdbBszi4WZeKTLNjLXhemtJgEb65jUMf074ANUxBQSq ZCnKFmjXMp011w6lBWqfwgXuDlNTi1sL5G85rOxzIpbs+4XsfVw9BwafVG1hHc5zjkjn DAUxWoI5Gl23gEUsMjHf/J9gUhcDvYaZ75xJmr2G6kz5g9kXcjuPAtJGZKoABTqatpkX 90EKSznB5ris6/FyS57ezh3yxVmTgOG4tKGyPB1jtXf1YwKoKF4225Cp1NOZjA8RmHCx r8vg== X-Gm-Message-State: AOUpUlHTnlW5l+kj4lHDKWA4yKARhBkvrumgDZq8fX3uAws3fPP3n0EN jX+1qLuuMEKMCNS5Gcy4tJsCZOuY+YujXKlo6s+FRtHkL6voOUw5lSEylnqGnDEzbAZQnvZZKKt DDTEtpttm3OcxHSaMsTPoYPGBTuYzdviIK7wfzA7nUFebwXtTwYe6PBnf/CUCcWZZCwEXLUWWEk 0PzB9USwDgtf4Fu1DiDpByH/oQUfCzo/oBs03JP1Zh/oYlwHMisi4RGT3ieM5P4q29Ki2NtbOH2 BbB8hDkQv4QHf+1lcSg6dYBJGLLHp/4XxSMXez8sWfsNK+Hf5wNKjBJrcYBeHV7PZn7iY/g7BQb t2WCS/nj9ClFURoXfkRV1qZy0JQG/fShB/ffQkSxxjvV0v2NsFj43dF6PhI7FWoI3GqlwpK5pT1 K X-Received: by 2002:a81:c10e:: with SMTP id f14-v6mr3099773ywi.52.1531123594832; Mon, 09 Jul 2018 01:06:34 -0700 (PDT) X-Received: by 2002:a81:c10e:: with SMTP id f14-v6mr3099762ywi.52.1531123594273; Mon, 09 Jul 2018 01:06:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1531123594; cv=none; d=google.com; s=arc-20160816; b=un1ieRzSqZ9NNxKdm10alb5W0ZS41DvE9FbCfXvlcqUM2XjkJP0b3C9eDHao+ujBSf QYwdvkGSmrzmpf1xFzRetpHzwi6gicUgRWbtfD6ah+OpS+7ueP6c7hpOUAUJlS4D+Lh3 CFbqYl5yqREMUAOYOUD2logwVjYhJoGUPuOp4At29fMbK1V7RvCkqj+9wbeALIaVji9I zkjDkNuOHSQrFOEBuQGBKyndNVnrn0VjP4JCLBYwI823n2LJ2+3LjDBBHEnE+9Zrg9bw Zoa0XwzaFkIKwZ8ULMkXewZO0PqW4Zl/RHW04hNlS/o4H1CECCpIoh6iv51/6nHMfute dAeg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=7S1uPsIr5ADBgcsgfQb4AMK/6T1OOwRBEXslU8sjZiY=; b=LChRONmb6Eab0E0AXUfTrgfuKFinhoG8XSIrdfsM3KmTeQcqDjiQ95B6ayhriJ0Jpj 6eSuYtcocCkB6ZmiBP670XmhN5OVdstAyIGRm8X60f+toBK0AWKg1wC5cBo2OIGdMX4q oMOBIdZmXLXYFLHnikaSYsDgXn5xPY/PU9fuU4oJt/Lph+gdBKFGjoaToIINoLjFl2cF 2/za8qo8291jxf2AKs9fJnhY0lpOgY4dmR4VUdyWb9acj98sAkYqO2ZPhe+iEAm35ZSD xDdIWun1keSoFO6Fo5RVn3rSjHAdZBdYxNQfwX8u2Pw+AuGgInZbyCyTasSPVn+43Lyc ZqzQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=kwIJgKrE; spf=pass (google.com: domain of john.hubbard@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=john.hubbard@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id d123-v6sor3548013ybh.80.2018.07.09.01.06.34 for (Google Transport Security); Mon, 09 Jul 2018 01:06:34 -0700 (PDT) Received-SPF: pass (google.com: domain of john.hubbard@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=kwIJgKrE; spf=pass (google.com: domain of john.hubbard@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=john.hubbard@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=7S1uPsIr5ADBgcsgfQb4AMK/6T1OOwRBEXslU8sjZiY=; b=kwIJgKrE0YOzuOXJvBG9U+xP5LxBts9K2k1ZRAtY7CcW2slMAlN9pAHZNx3DVtl2DO JHc3YYglBOk4Ykw59UIzu6vxs/x0yut94bXwKpr9aIXZ4eAS+lsMtg59+59rc2j0gOAZ yVsxwMKVZfqcv3lIy/SNOugOgFo1xBEZiiWCpAfhAq6fWaDioArMnRwZ3630405WV0M6 v4DxPqMAe/Zn+JX14cCtubT0ecuciRTlUTJrrN5Pet++Glk+OdZyDDU9IM1jBRoajjQE uGx+aqgKYTQJ8EsbQO0WcxtZHMPDoJ4X5uMZgOkW+syh//s3DAvCPgAOBAINP99ZvsaJ bvNw== X-Google-Smtp-Source: AAOMgpcPEHeVirfQm8JXNox+KWiLSEVztBX+fVQf/b7dx2Q+QbR9+nSiNbcyUsQ/BCM2ZmrAGPXz2A== X-Received: by 2002:a25:403:: with SMTP id 3-v6mr10679430ybe.396.1531123594044; Mon, 09 Jul 2018 01:06:34 -0700 (PDT) Received: from sandstorm.nvidia.com ([2600:1700:43b0:3120:feaa:14ff:fe9e:34cb]) by smtp.gmail.com with ESMTPSA id w64-v6sm6339514ywe.46.2018.07.09.01.06.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Jul 2018 01:06:33 -0700 (PDT) From: john.hubbard@gmail.com X-Google-Original-From: jhubbard@nvidia.com To: Matthew Wilcox , Michal Hocko , Christopher Lameter , Jason Gunthorpe , Dan Williams , Jan Kara , Al Viro Cc: linux-mm@kvack.org, LKML , linux-rdma , linux-fsdevel@vger.kernel.org, John Hubbard Subject: [PATCH 1/2] mm: introduce put_user_page(), placeholder version Date: Mon, 9 Jul 2018 01:05:53 -0700 Message-Id: <20180709080554.21931-2-jhubbard@nvidia.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180709080554.21931-1-jhubbard@nvidia.com> References: <20180709080554.21931-1-jhubbard@nvidia.com> X-NVConfidentiality: public 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: X-Virus-Scanned: ClamAV using ClamSMTP From: John Hubbard Introduces put_user_page(), which simply calls put_page(). This provides a safe way to update all get_user_pages*() callers, so that they call put_user_page(), instead of put_page(). Also adds release_user_pages(), a drop-in replacement for release_pages(). This is intended to be easily grep-able, for later performance improvements, since release_user_pages is not batched like release_pages is, and is significantly slower. Subsequent patches will add functionality to put_user_page(). Signed-off-by: John Hubbard --- include/linux/mm.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index a0fbb9ffe380..db4a211aad79 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -923,6 +923,20 @@ static inline void put_page(struct page *page) __put_page(page); } +/* Placeholder version, until all get_user_pages*() callers are updated. */ +static inline void put_user_page(struct page *page) +{ + put_page(page); +} + +/* A drop-in replacement for release_pages(): */ +static inline void release_user_pages(struct page **pages, + unsigned long npages) +{ + while (npages) + put_user_page(pages[--npages]); +} + #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) #define SECTION_IN_PAGE_FLAGS #endif