From patchwork Mon May 18 01:21:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Hubbard X-Patchwork-Id: 11554523 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0EB31913 for ; Mon, 18 May 2020 01:22:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CFFE1207F9 for ; Mon, 18 May 2020 01:22:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="qe8apbDx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CFFE1207F9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 43B1F8000E; Sun, 17 May 2020 21:22:02 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 373038000B; Sun, 17 May 2020 21:22:02 -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 0E4FA8000E; Sun, 17 May 2020 21:22:01 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0196.hostedemail.com [216.40.44.196]) by kanga.kvack.org (Postfix) with ESMTP id D2C9F8000B for ; Sun, 17 May 2020 21:22:01 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 86AA64853 for ; Mon, 18 May 2020 01:22:01 +0000 (UTC) X-FDA: 76828088442.24.trip20_860b09d4b4f3d X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,jhubbard@nvidia.com,,RULES_HIT:30054:30064,0,RBL:216.228.121.143:@nvidia.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: trip20_860b09d4b4f3d X-Filterd-Recvd-Size: 4917 Received: from hqnvemgate24.nvidia.com (hqnvemgate24.nvidia.com [216.228.121.143]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Mon, 18 May 2020 01:22:00 +0000 (UTC) Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Sun, 17 May 2020 18:19:38 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Sun, 17 May 2020 18:21:59 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Sun, 17 May 2020 18:21:59 -0700 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 18 May 2020 01:21:59 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 18 May 2020 01:21:59 +0000 Received: from sandstorm.nvidia.com (Not Verified[10.2.48.175]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Sun, 17 May 2020 18:21:59 -0700 From: John Hubbard To: Andrew Morton CC: Andy Walls , Mauro Carvalho Chehab , , LKML , , John Hubbard Subject: [PATCH 1/2] mm/gup: introduce pin_user_pages_unlocked Date: Sun, 17 May 2020 18:21:56 -0700 Message-ID: <20200518012157.1178336-2-jhubbard@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518012157.1178336-1-jhubbard@nvidia.com> References: <20200518012157.1178336-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1589764778; bh=+Bd2dKwO1m4xCknqEnntHu5ZR7ZzO/a9Yy+seiDwYQk=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=qe8apbDxfUOL34853vKL5Pm+EM2eEzJsyeg7TK3MuFDBhyRG+KGRXrfIauwl9kbnd EmVvRzb6mGS5pB2ULYsghn/hyU+gebu4Pp5pnV2Wts3D8L9LcSKErKF2UKsYujF2Nm ckthj0MxtSyWUcabjdBEafMngtKanymPa8HEh9J77CLEDvdtTJsstct6wlz7pqEEfW nYhEvXxAUiyGKHHIZ7F8RGZVsseT35PmooJKRPSH+h6gO9FK3ql5Ci8niH2a0WVQL4 hH0G2nciKNm0jpEWVSZ+/uOKp3kNxLfdba5Pg7NwIKXwTNJnon+5wJ2U81Xci+1kzL bMPhYFJb+cIXw== 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: Introduce pin_user_pages_unlocked(), which is nearly identical to the get_user_pages_unlocked() that it wraps, except that it sets FOLL_PIN and rejects FOLL_GET. Signed-off-by: John Hubbard --- include/linux/mm.h | 2 ++ mm/gup.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) base-commit: b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce prerequisite-patch-id: 0496235d2f0b29f75b9835e63a6923ddad6d0260 prerequisite-patch-id: 2711b9393a74cd0e1fcf48befea3618f7bb1ca9e prerequisite-patch-id: 95e2521748b3058710fb2a161b2c76389644665b prerequisite-patch-id: eeae300399f69db2cd61535b40c1f1ee1929195a prerequisite-patch-id: 9ed26cdb071ab084a204c85a08986806d6bae877 diff --git a/include/linux/mm.h b/include/linux/mm.h index 5a323422d783..a5594ac9ebe3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1702,6 +1702,8 @@ long get_user_pages_locked(unsigned long start, unsigned long nr_pages, unsigned int gup_flags, struct page **pages, int *locked); long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, struct page **pages, unsigned int gup_flags); +long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, + struct page **pages, unsigned int gup_flags); int get_user_pages_fast(unsigned long start, int nr_pages, unsigned int gup_flags, struct page **pages); diff --git a/mm/gup.c b/mm/gup.c index 87a6a59fe667..50cd9323efff 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2939,3 +2939,20 @@ long pin_user_pages(unsigned long start, unsigned long nr_pages, pages, vmas, gup_flags); } EXPORT_SYMBOL(pin_user_pages); + +/* + * pin_user_pages_unlocked() is the FOLL_PIN variant of + * get_user_pages_unlocked(). Behavior is the same, except that this one sets + * FOLL_PIN and rejects FOLL_GET. + */ +long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, + struct page **pages, unsigned int gup_flags) +{ + /* FOLL_GET and FOLL_PIN are mutually exclusive. */ + if (WARN_ON_ONCE(gup_flags & FOLL_GET)) + return -EINVAL; + + gup_flags |= FOLL_PIN; + return get_user_pages_unlocked(start, nr_pages, pages, gup_flags); +} +EXPORT_SYMBOL(pin_user_pages_unlocked);