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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 7EB18C74A44 for ; Sun, 14 Jul 2019 19:11:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 522DE20644 for ; Sun, 14 Jul 2019 19:11:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="J6HG5WoH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728742AbfGNTL1 (ORCPT ); Sun, 14 Jul 2019 15:11:27 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:40682 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728125AbfGNTL0 (ORCPT ); Sun, 14 Jul 2019 15:11:26 -0400 Received: by mail-pf1-f196.google.com with SMTP id p184so6417374pfp.7; Sun, 14 Jul 2019 12:11:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=wTnR4jFSZHgDyQlzGAnxJLHPwWt9ff7eR4/YXCAXskI=; b=J6HG5WoHErAl5v76PYLUAOefrG8S1mG5ji2ajAmi5iUq3zdhofWNi8R7FD/ZClvCkS YZRIbPxD9g4+z4/DKU3BnFzdBGd4B6hqacPQJCYiMAyTsjeQD0VnMRdVjMwT5iXX3Wf8 K+dbgDP1QPuW9rFsXWNsx8mrnpo7er2XDn6BWvY/4l765HNnJzRdfTLFd1FC4ox/btui ANCUJV2jLkQANmaHn5GDebVXYHTnQ3iJntGgl9m+NUdNzEI4foq7AImezy1e0F0aWScj VTeFTRsX3XhDhFo4Vbx8wmcHarhMhRhIWCsne9M3/awdd48pqQRhjBDTphYabLqRYTaO N99A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=wTnR4jFSZHgDyQlzGAnxJLHPwWt9ff7eR4/YXCAXskI=; b=nxQSYNkJOc1wNLQfY3X+GYLn1XTJHbnHvpHezIMjxbmj9yrF6+X8kB/RTLnENrkqir 1Wz1tSz1piYmZHhb+87mllrR8q7xMmYUofc+5guLbqBI898cTipGLjhIbg7U9I4LrMi9 IWPlfPS/RA4vZfJQf4PQeZxdf4SAMso4UkJpbz2sqJ4BtXWvLgoqNtkdxqoxV3gxqyBj vd+0m0kM7h27A44pVnuE5VlKey9No9yfBVWxtLHOu8XhweEPNGtkBBu/bl/K1DhVXh1m t9hDZw8IdsZKIFcdUeIdtuSpogOVOy7PjzEYTULEhS1/rjM9qxX4jNXir6WgYlExRNFV mq7w== X-Gm-Message-State: APjAAAUNo9lh8RxDvrDCJnAHngqRI1Tp7f4eV7551CFuidqB3os5QXEK 3whkAA3LmtzPBPeaua6RiPu906NLj2s= X-Google-Smtp-Source: APXvYqyoHwB+daqurf2TSePudMpL8bWbCxyh/0egoU2EbeU8TkfMkMtKnPM0Ke06j90ArJCf2o75Kg== X-Received: by 2002:a63:bf01:: with SMTP id v1mr22482786pgf.278.1563131484751; Sun, 14 Jul 2019 12:11:24 -0700 (PDT) Received: from bharath12345-Inspiron-5559 ([103.110.42.34]) by smtp.gmail.com with ESMTPSA id m6sm15239358pfb.151.2019.07.14.12.11.22 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 14 Jul 2019 12:11:24 -0700 (PDT) From: Bharath Vedartham To: akpm@linux-foundation.org, ira.weiny@intel.com, jhubbard@nvidia.com Cc: Bharath Vedartham , Mauro Carvalho Chehab , Dimitri Sivanich , Arnd Bergmann , Greg Kroah-Hartman , Alex Williamson , Cornelia Huck , Jens Axboe , Alexander Viro , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Magnus Karlsson , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Enrico Weigelt , Thomas Gleixner , Alexios Zavras , Dan Carpenter , Max Filippov , Matt Sickler , "Kirill A. Shutemov" , Keith Busch , YueHaibing , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, kvm@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, bpf@vger.kernel.org, xdp-newbies@vger.kernel.org Subject: [PATCH] mm/gup: Use put_user_page*() instead of put_page*() Date: Mon, 15 Jul 2019 00:38:34 +0530 Message-Id: <1563131456-11488-1-git-send-email-linux.bhar@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch converts all call sites of get_user_pages to use put_user_page*() instead of put_page*() functions to release reference to gup pinned pages. This is a bunch of trivial conversions which is a part of an effort by John Hubbard to solve issues with gup pinned pages and filesystem writeback. The issue is more clearly described in John Hubbard's patch[1] where put_user_page*() functions are introduced. Currently put_user_page*() simply does put_page but future implementations look to change that once treewide change of put_page callsites to put_user_page*() is finished. The lwn article describing the issue with gup pinned pages and filesystem writeback [2]. This patch has been tested by building and booting the kernel as I don't have the required hardware to test the device drivers. I did not modify gpu/drm drivers which use release_pages instead of put_page() to release reference of gup pinned pages as I am not clear whether release_pages and put_page are interchangable. [1] https://lkml.org/lkml/2019/3/26/1396 [2] https://lwn.net/Articles/784574/ Signed-off-by: Bharath Vedartham --- drivers/media/v4l2-core/videobuf-dma-sg.c | 3 +-- drivers/misc/sgi-gru/grufault.c | 2 +- drivers/staging/kpc2000/kpc_dma/fileops.c | 4 +--- drivers/vfio/vfio_iommu_type1.c | 2 +- fs/io_uring.c | 7 +++---- mm/gup_benchmark.c | 6 +----- net/xdp/xdp_umem.c | 7 +------ 7 files changed, 9 insertions(+), 22 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c index 66a6c6c..d6eeb43 100644 --- a/drivers/media/v4l2-core/videobuf-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf-dma-sg.c @@ -349,8 +349,7 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma) BUG_ON(dma->sglen); if (dma->pages) { - for (i = 0; i < dma->nr_pages; i++) - put_page(dma->pages[i]); + put_user_pages(dma->pages, dma->nr_pages); kfree(dma->pages); dma->pages = NULL; } diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index 4b713a8..61b3447 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -188,7 +188,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma, if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0) return -EFAULT; *paddr = page_to_phys(page); - put_page(page); + put_user_page(page); return 0; } diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c b/drivers/staging/kpc2000/kpc_dma/fileops.c index 6166587..26dceed 100644 --- a/drivers/staging/kpc2000/kpc_dma/fileops.c +++ b/drivers/staging/kpc2000/kpc_dma/fileops.c @@ -198,9 +198,7 @@ int kpc_dma_transfer(struct dev_private_data *priv, struct kiocb *kcb, unsigned sg_free_table(&acd->sgt); err_dma_map_sg: err_alloc_sg_table: - for (i = 0 ; i < acd->page_count ; i++){ - put_page(acd->user_pages[i]); - } + put_user_pages(acd->user_pages, acd->page_count); err_get_user_pages: kfree(acd->user_pages); err_alloc_userpages: diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index add34ad..c491524 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -369,7 +369,7 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr, */ if (ret > 0 && vma_is_fsdax(vmas[0])) { ret = -EOPNOTSUPP; - put_page(page[0]); + put_user_page(page[0]); } } up_read(&mm->mmap_sem); diff --git a/fs/io_uring.c b/fs/io_uring.c index 4ef62a4..b4a4549 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2694,10 +2694,9 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, * if we did partial map, or found file backed vmas, * release any pages we did get */ - if (pret > 0) { - for (j = 0; j < pret; j++) - put_page(pages[j]); - } + if (pret > 0) + put_user_pages(pages, pret); + if (ctx->account_mem) io_unaccount_mem(ctx->user, nr_pages); kvfree(imu->bvec); diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index 7dd602d..15fc7a2 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -76,11 +76,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd, gup->size = addr - gup->addr; start_time = ktime_get(); - for (i = 0; i < nr_pages; i++) { - if (!pages[i]) - break; - put_page(pages[i]); - } + put_user_pages(pages, nr_pages); end_time = ktime_get(); gup->put_delta_usec = ktime_us_delta(end_time, start_time); diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c index 9c6de4f..6103e19 100644 --- a/net/xdp/xdp_umem.c +++ b/net/xdp/xdp_umem.c @@ -173,12 +173,7 @@ static void xdp_umem_unpin_pages(struct xdp_umem *umem) { unsigned int i; - for (i = 0; i < umem->npgs; i++) { - struct page *page = umem->pgs[i]; - - set_page_dirty_lock(page); - put_page(page); - } + put_user_pages_dirty_lock(umem->pgs, umem->npgs); kfree(umem->pgs); umem->pgs = NULL; -- 1.8.3.1