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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39CC2C64ED6 for ; Mon, 27 Feb 2023 15:25:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229562AbjB0PZL (ORCPT ); Mon, 27 Feb 2023 10:25:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230161AbjB0PZH (ORCPT ); Mon, 27 Feb 2023 10:25:07 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 233E711E89 for ; Mon, 27 Feb 2023 07:24:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677511464; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=NWdwiI4PJ+IBncsrNHjeMLRPIquT5DILZIcxMXt8jUI=; b=Pdqv8WUDQv6PbAptR4HfutVc62DGrzVecrCQzPc9m3NGOxGjmMMRMsZ3uv2wc8Gb1E7FB8 HS3fk4U6s87RrtnoQzGi0oaFDZjgXjMWhYOZTa0OEjMHsfSri6Tiol7oPcaQFpopEm7y0r uJNcrdymGK6TLivVfhd7q/eK549M1Vg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-183-XHmEih5kMpWQMmNTXrNLrw-1; Mon, 27 Feb 2023 10:24:22 -0500 X-MC-Unique: XHmEih5kMpWQMmNTXrNLrw-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 18B33830F81; Mon, 27 Feb 2023 15:24:22 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 13A182026D68; Mon, 27 Feb 2023 15:24:20 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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