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[47.55.122.23]) by smtp.gmail.com with ESMTPSA id h2-20020ac85042000000b003a606428a59sm2189506qtm.91.2022.11.16.16.45.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Nov 2022 16:45:45 -0800 (PST) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1ovT2G-0066Tl-Ts; Wed, 16 Nov 2022 20:45:44 -0400 Date: Wed, 16 Nov 2022 20:45:44 -0400 From: Jason Gunthorpe To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, 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 , Andrew Morton , John Hubbard , Peter Xu , Greg Kroah-Hartman , Andrea Arcangeli , Hugh Dickins , Nadav Amit , Vlastimil Babka , Matthew Wilcox , Mike Kravetz , Muchun Song , Shuah Khan , Lucas Stach , David Airlie , Oded Gabbay , Arnd Bergmann , Christoph Hellwig , Alex Williamson , Christian Benvenuti , Nelson Escobar , Leon Romanovsky Subject: Re: [PATCH mm-unstable v1 11/20] RDMA/usnic: remove FOLL_FORCE usage Message-ID: References: <20221116102659.70287-1-david@redhat.com> <20221116102659.70287-12-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221116102659.70287-12-david@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 16, 2022 at 11:26:50AM +0100, David Hildenbrand wrote: > GUP now supports reliable R/O long-term pinning in COW mappings, such > that we break COW early. MAP_SHARED VMAs only use the shared zeropage so > far in one corner case (DAXFS file with holes), which can be ignored > because GUP does not support long-term pinning in fsdax (see > check_vma_flags()). > > Consequently, FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM is no longer required > for reliable R/O long-term pinning: FOLL_LONGTERM is sufficient. So stop > using FOLL_FORCE, which is really only for ptrace access. > > Cc: Christian Benvenuti > Cc: Nelson Escobar > Cc: Jason Gunthorpe > Cc: Leon Romanovsky > Signed-off-by: David Hildenbrand > --- > drivers/infiniband/hw/usnic/usnic_uiom.c | 9 ++++----- > 1 file changed, 4 insertions(+), 5 deletions(-) Reviewed-by: Jason Gunthorpe Jason