Message ID | 20221116102659.70287-18-david@redhat.com (mailing list archive) |
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State | Not Applicable |
Headers |
Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from <linux-media-owner@vger.kernel.org>) id 1ovFq4-00Eved-Dn; Wed, 16 Nov 2022 10:40:17 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238535AbiKPKkN (ORCPT <rfc822;mkrufky@linuxtv.org> + 1 other); Wed, 16 Nov 2022 05:40:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237604AbiKPKio (ORCPT <rfc822;linux-media@vger.kernel.org>); Wed, 16 Nov 2022 05:38:44 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DFF782FFCB for <linux-media@vger.kernel.org>; Wed, 16 Nov 2022 02:29:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668594578; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rGA6GaR1az8P6UEdLsolXmCEn/P8qFigXL+8tO23Tsc=; b=EJHHdFmKn0s21LvsKtFCIUgcD7Rl9F4uQfi0qOoDrm+aXCjmBdxO11ovrhGwNJfh+Zv9U/ ghbTglOEtsR8VJzae6LtBDtcj9CWPlCRtcWq8anQ7MLpkHDa4oDyYKlpAKRnA5S0FfRUyw i0kDQick9LglVnA9rcX6Zrqcp7AR2uU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-166-zpGAvGWpOfO4G6I5WZe6qQ-1; Wed, 16 Nov 2022 05:29:34 -0500 X-MC-Unique: zpGAvGWpOfO4G6I5WZe6qQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2B0731C0A10A; Wed, 16 Nov 2022 10:29:33 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.216]) by smtp.corp.redhat.com (Postfix) with ESMTP id 82BA82028E8F; Wed, 16 Nov 2022 10:29:25 +0000 (UTC) From: David Hildenbrand <david@redhat.com> To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kselftest@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Jason Gunthorpe <jgg@ziepe.ca>, John Hubbard <jhubbard@nvidia.com>, Peter Xu <peterx@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com>, Nadav Amit <namit@vmware.com>, Vlastimil Babka <vbabka@suse.cz>, Matthew Wilcox <willy@infradead.org>, Mike Kravetz <mike.kravetz@oracle.com>, Muchun Song <songmuchun@bytedance.com>, Shuah Khan <shuah@kernel.org>, Lucas Stach <l.stach@pengutronix.de>, David Airlie <airlied@gmail.com>, Oded Gabbay <ogabbay@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Christoph Hellwig <hch@infradead.org>, Alex Williamson <alex.williamson@redhat.com>, David Hildenbrand <david@redhat.com>, Inki Dae <inki.dae@samsung.com>, Seung-Woo Kim <sw0312.kim@samsung.com>, Kyungmin Park <kyungmin.park@samsung.com>, Daniel Vetter <daniel@ffwll.ch>, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Subject: [PATCH mm-unstable v1 17/20] drm/exynos: remove FOLL_FORCE usage Date: Wed, 16 Nov 2022 11:26:56 +0100 Message-Id: <20221116102659.70287-18-david@redhat.com> In-Reply-To: <20221116102659.70287-1-david@redhat.com> References: <20221116102659.70287-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-media.vger.kernel.org> X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIMWL_WL_HIGH=0.001,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no |
Series |
mm/gup: remove FOLL_FORCE usage from drivers (reliable R/O long-term pinning)
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Commit Message
David Hildenbrand
Nov. 16, 2022, 10:26 a.m. UTC
FOLL_FORCE is really only for ptrace access. As we unpin the pinned pages
using unpin_user_pages_dirty_lock(true), the assumption is that all these
pages are writable.
FOLL_FORCE in this case seems to be a legacy leftover. Let's just remove
it.
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Wed, Nov 16, 2022 at 11:26:56AM +0100, David Hildenbrand wrote: > FOLL_FORCE is really only for ptrace access. As we unpin the pinned pages > using unpin_user_pages_dirty_lock(true), the assumption is that all these > pages are writable. > > FOLL_FORCE in this case seems to be a legacy leftover. Let's just remove > it. > > Cc: Inki Dae <inki.dae@samsung.com> > Cc: Seung-Woo Kim <sw0312.kim@samsung.com> > Cc: Kyungmin Park <kyungmin.park@samsung.com> > Cc: David Airlie <airlied@gmail.com> > Cc: Daniel Vetter <daniel@ffwll.ch> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> > Signed-off-by: David Hildenbrand <david@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Plus ack for merging through the appropriate non-drm tree. -Daniel > --- > drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c > index 471fd6c8135f..e19c2ceb3759 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c > @@ -477,7 +477,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, > } > > ret = pin_user_pages_fast(start, npages, > - FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, > + FOLL_WRITE | FOLL_LONGTERM, > g2d_userptr->pages); > if (ret != npages) { > DRM_DEV_ERROR(g2d->dev, > -- > 2.38.1 >
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 471fd6c8135f..e19c2ceb3759 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -477,7 +477,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, } ret = pin_user_pages_fast(start, npages, - FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, + FOLL_WRITE | FOLL_LONGTERM, g2d_userptr->pages); if (ret != npages) { DRM_DEV_ERROR(g2d->dev,