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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 A6454C433E0 for ; Tue, 2 Jun 2020 04:48:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 68DD42077D for ; Tue, 2 Jun 2020 04:48:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="P9mcnNPf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 68DD42077D 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 16D2D28001E; Tue, 2 Jun 2020 00:48:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 11DF8280012; Tue, 2 Jun 2020 00:48:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EFF7328001E; Tue, 2 Jun 2020 00:48:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0072.hostedemail.com [216.40.44.72]) by kanga.kvack.org (Postfix) with ESMTP id CF3DE280012 for ; Tue, 2 Jun 2020 00:48:29 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 98F062471 for ; Tue, 2 Jun 2020 04:48:29 +0000 (UTC) X-FDA: 76883040738.18.waves14_2d0231a25880a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id 829A3100EDBEF for ; Tue, 2 Jun 2020 04:48:29 +0000 (UTC) X-HE-Tag: waves14_2d0231a25880a X-Filterd-Recvd-Size: 3481 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf10.hostedemail.com (Postfix) with ESMTP for ; Tue, 2 Jun 2020 04:48:29 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (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 2CF03207D0; Tue, 2 Jun 2020 04:48:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591073308; bh=+zOVhw2/xt4PK5afXeLHzRE2A0iPjLkp62RSiKFDFv8=; h=Date:From:To:Subject:In-Reply-To:From; b=P9mcnNPfhBY5DBPJeyeDJGxhtbtUjByqYSzWlasJOK+YpE+3k3lcMZx7baRXSR5p3 oZP1qthdjiiiuYR29QZSu0zXYP3uil2QT5Btz5fwXfd7qFxsenKvLF+HKoVl1SYT/l KIwjNXHbAKH6P5icBWJ5H283zzR8ZE4fFL9D6fZ4= Date: Mon, 01 Jun 2020 21:48:27 -0700 From: Andrew Morton To: akpm@linux-foundation.org, awalls@md.metrocast.net, jhubbard@nvidia.com, linux-mm@kvack.org, mchehab@kernel.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 055/128] mm/gup: introduce pin_user_pages_unlocked Message-ID: <20200602044827.BhsiaDO-Z%akpm@linux-foundation.org> In-Reply-To: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 829A3100EDBEF X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: From: John Hubbard Subject: mm/gup: introduce pin_user_pages_unlocked 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. Link: http://lkml.kernel.org/r/20200518012157.1178336-2-jhubbard@nvidia.com Signed-off-by: John Hubbard Reviewed-by: Andrew Morton Cc: Andy Walls Cc: Mauro Carvalho Chehab Signed-off-by: Andrew Morton --- include/linux/mm.h | 2 ++ mm/gup.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) --- a/include/linux/mm.h~mm-gup-introduce-pin_user_pages_unlocked +++ a/include/linux/mm.h @@ -1713,6 +1713,8 @@ long get_user_pages_locked(unsigned long 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); --- a/mm/gup.c~mm-gup-introduce-pin_user_pages_unlocked +++ a/mm/gup.c @@ -2960,3 +2960,20 @@ long pin_user_pages(unsigned long start, 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); _