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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <2734058.1677507812@warthog.procyon.org.uk> To: Matthew Wilcox Cc: dhowells@redhat.com, Miklos Szeredi , Amit Shah , linux-fsdevel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] splice: Prevent gifting of multipage folios MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <2737654.1677511460.1@warthog.procyon.org.uk> Date: Mon, 27 Feb 2023 15:24:20 +0000 Message-ID: <2737655.1677511460@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B91D3C0010 X-Stat-Signature: wbywgogyjusj6j9zgsbj7pkrd1s6gofk X-Rspam-User: X-HE-Tag: 1677511466-373307 X-HE-Meta: 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 3p1052gO 4SKKdmzM6AZYaFxkvfphr0t281bbdT6NI/Ig2fRuFBGstSmKnA6TB8i2dF+kQyUL/gro8GxRfe6YnCMzJC9ot6qoONK+VoB8IR+c6iiKB4gk2jwpctZvPi+Pp/M0rSWZI06HKVAqc9grlw0OLiyCrpQ9ypgegYy730d113wW4HumtBgwxNjNH96Qd1k1lMMQ6vVvMixYH5oyePsH5anLVHs0yRI+yzrF7EQF9 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: Matthew Wilcox wrote: > What should the Fixes: here be? This was already possible with THPs > (both anon and tmpfs backed) long before I introduced folios. Good question. How do I tell when THPs were introduced? It looks like they might predate git, looking at free_compound_page()'s comment. David