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[47.55.122.23]) by smtp.gmail.com with ESMTPSA id i18-20020a05620a405200b006fa84082b6dsm11394495qko.128.2022.11.16.16.46.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Nov 2022 16:46:03 -0800 (PST) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1ovT2Z-0066UZ-3n; Wed, 16 Nov 2022 20:46:03 -0400 Date: Wed, 16 Nov 2022 20:46:03 -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 , Bernard Metzler , Leon Romanovsky Subject: Re: [PATCH mm-unstable v1 12/20] RDMA/siw: remove FOLL_FORCE usage Message-ID: References: <20221116102659.70287-1-david@redhat.com> <20221116102659.70287-13-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221116102659.70287-13-david@redhat.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668645965; a=rsa-sha256; cv=none; b=fS5xZ2B1F/Fi4tndNRgGHnbvZvVS4NUQMu8AnK0ZNn16T7RIuRe96yD7z4EEObe/7IsZSV NO4PkaWqLYOLFXfeW9XUA+uyMfl8UmNF/1QfmyfklSjsTByQVXBzXzmtXR/vsAMWc+zovU 7HVHAxBkAGcuMcUfmI20j+euMWN+qrQ= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=VV2cb+pd; dmarc=none; spf=pass (imf08.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.222.175 as permitted sender) smtp.mailfrom=jgg@ziepe.ca ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668645965; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rT9xjSJmKp4cCvf16bTKl9Dc4YEY7MjOtsK/w44qv+E=; b=YqJmwxMABcpIdH23ihdVmqJyVkgEUg+Qs2phZV6ZeqG3MapkOdNkmz3gS7cBtr0il34UwR puwarO0a/i924ufBQ19ip2zBNcvX5S/0N/UIvmfqw2JuCyNMDSIwMEx33+b/163DEBDWDz R9D5jNXv1fZEijyIJPLmI9MRhL1kJns= X-Stat-Signature: 6ghdprg1doam5xcxymz31mpdyw38n9ba X-Rspamd-Queue-Id: 3EC11160006 X-Rspam-User: Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=VV2cb+pd; dmarc=none; spf=pass (imf08.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.222.175 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-Rspamd-Server: rspam09 X-HE-Tag: 1668645965-837051 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: On Wed, Nov 16, 2022 at 11:26:51AM +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: Bernard Metzler > Cc: Jason Gunthorpe > Cc: Leon Romanovsky > Signed-off-by: David Hildenbrand > --- > drivers/infiniband/sw/siw/siw_mem.c | 9 ++++----- > 1 file changed, 4 insertions(+), 5 deletions(-) Reviewed-by: Jason Gunthorpe Jason