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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 6956BC433E0 for ; Wed, 27 May 2020 22:32:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 104F620707 for ; Wed, 27 May 2020 22:32:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="SKkdpxYi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 104F620707 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 4BCA9800B7; Wed, 27 May 2020 18:32:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 46C008001A; Wed, 27 May 2020 18:32:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 333C9800B7; Wed, 27 May 2020 18:32:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0241.hostedemail.com [216.40.44.241]) by kanga.kvack.org (Postfix) with ESMTP id 1ABA28001A for ; Wed, 27 May 2020 18:32:49 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id B57A08248068 for ; Wed, 27 May 2020 22:32:48 +0000 (UTC) X-FDA: 76863950016.20.cap32_6fc651eedff0e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id 9AEC4180C07AB for ; Wed, 27 May 2020 22:32:48 +0000 (UTC) X-HE-Tag: cap32_6fc651eedff0e X-Filterd-Recvd-Size: 4263 Received: from hqnvemgate25.nvidia.com (hqnvemgate25.nvidia.com [216.228.121.64]) by imf24.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 22:32:47 +0000 (UTC) Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 27 May 2020 15:31:23 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 27 May 2020 15:32:46 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 27 May 2020 15:32:46 -0700 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 27 May 2020 22:32:46 +0000 Received: from rnnvemgw01.nvidia.com (10.128.109.123) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 27 May 2020 22:32:46 +0000 Received: from sandstorm.nvidia.com (Not Verified[10.2.87.74]) by rnnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 27 May 2020 15:32:45 -0700 From: John Hubbard To: Andrew Morton CC: LKML , , John Hubbard Subject: [PATCH 2/2] mm/gup: frame_vector: convert get_user_pages() --> pin_user_pages() Date: Wed, 27 May 2020 15:32:43 -0700 Message-ID: <20200527223243.884385-3-jhubbard@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527223243.884385-1-jhubbard@nvidia.com> References: <20200527223243.884385-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1590618683; bh=sWvJDniuNa0MloWGBo3nO/qwt/IUY5Pd+BokGdPrg7M=; 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=SKkdpxYia+zl8I1G5aytJpugRzjxOPugRFmINeXYNJyvv2wNBDukmddpHstDNZ4PQ 1aCOw+8GDWZlXhZ6C6i8g+UjIArzo16lNFuKbFNWekzRe/N8w81kArI55DnWNoL0T0 rLUBTUj/hTu0eUsJvN/PGKFmgeRYL5rfhiVj5mc/nPCgedQ/oxsx2yQUM89zK5D2vP pJN16iaiiJEnWDZ6X5TiRvTVAH010Vq1eMjMeEsdgRND8BChBrF9EVbvxscaHNSnrl j5H2FprhjqxJiUHAIrJmCHYDtFX/PZaizEr2Ia0lMrc88NVFRh3zYRloXamQQ28K2B mBQehtwhjhZfw== X-Rspamd-Queue-Id: 9AEC4180C07AB X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: This code was using get_user_pages*(), and all of the callers so far were in a "Case 2" scenario (DMA/RDMA), using the categorization from [1]. That means that it's time to convert the get_user_pages*() + put_page() calls to pin_user_pages*() + unpin_user_pages() calls. There is some helpful background in [2]: basically, this is a small part of fixing a long-standing disconnect between pinning pages, and file systems' use of those pages. [1] Documentation/core-api/pin_user_pages.rst [2] "Explicit pinning of user-space pages": https://lwn.net/Articles/807108/ Signed-off-by: John Hubbard --- mm/frame_vector.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/frame_vector.c b/mm/frame_vector.c index c431ca81dad5..4107dbca0056 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -72,7 +72,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr= _frames, if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref =3D true; vec->is_pfns =3D false; - ret =3D get_user_pages_locked(start, nr_frames, + ret =3D pin_user_pages_locked(start, nr_frames, gup_flags, (struct page **)(vec->ptrs), &locked); goto out; } @@ -122,7 +122,6 @@ EXPORT_SYMBOL(get_vaddr_frames); */ void put_vaddr_frames(struct frame_vector *vec) { - int i; struct page **pages; =20 if (!vec->got_ref) @@ -135,8 +134,8 @@ void put_vaddr_frames(struct frame_vector *vec) */ if (WARN_ON(IS_ERR(pages))) goto out; - for (i =3D 0; i < vec->nr_frames; i++) - put_page(pages[i]); + + unpin_user_pages(pages, vec->nr_frames); vec->got_ref =3D false; out: vec->nr_frames =3D 0; --=20 2.26.2