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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2876BEB64DA for ; Fri, 30 Jun 2023 19:55:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 770AD8E0049; Fri, 30 Jun 2023 15:55:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 720F78E000F; Fri, 30 Jun 2023 15:55:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E8328E0049; Fri, 30 Jun 2023 15:55:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 506338E000F for ; Fri, 30 Jun 2023 15:55:55 -0400 (EDT) Received: from smtpin19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 27A2840329 for ; Fri, 30 Jun 2023 19:55:55 +0000 (UTC) X-FDA: 80960469870.19.1F6D11C Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) by imf23.hostedemail.com (Postfix) with ESMTP id 2712E14001B for ; Fri, 30 Jun 2023 19:55:51 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=t-8ch.de header.s=mail header.b=W7jHlr6Z; dmarc=none; spf=pass (imf23.hostedemail.com: domain of thomas@t-8ch.de designates 159.69.126.157 as permitted sender) smtp.mailfrom=thomas@t-8ch.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1688154952; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=GUbfFX4ieS21q51+v876fkvs3wCOxqm6LWhirMM8tDQ=; b=nHWZDR7Bk36Uqq4ID69Rf+GuVuMYXMOcr32fLF0TifiRWjWPs8cMZV3vBQDx1lQ1VK9UxT 1QUsLX48WcC99cldyExiwe6Sahg7NpDXfVBol0vtwJLuT8FT4pZDtNWGRgXao4Vuv2I9O5 Rn28vJXNGLZa8hMuxQsWXrJKazQJLoI= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=t-8ch.de header.s=mail header.b=W7jHlr6Z; dmarc=none; spf=pass (imf23.hostedemail.com: domain of thomas@t-8ch.de designates 159.69.126.157 as permitted sender) smtp.mailfrom=thomas@t-8ch.de ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1688154952; a=rsa-sha256; cv=none; b=SsdyLvwDHIOt1eX2V0F0AtW7n3G74/6KtFywiCJ/8OfFEd/TU2lXczPHDg/8yFqelpd4XU OC6/vsSS7P2Zop/A4n08BN33E84175TKcy2LS5esOqKxzxyjnSFwk6967yJwoMa2+a/vD+ HohVlawi2AvHOh+3iCw4uj61vTTKexw= Date: Fri, 30 Jun 2023 21:55:47 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=t-8ch.de; s=mail; t=1688154949; bh=qO2t88Qohwhj2xIJpyQRKbtASY9ZCj2av7m7ovm4rCc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=W7jHlr6ZvfqHkHfCM7qxuvEZBCyGZWZp0h7lhmKP7eq62Pq8RWEhgKhdO8VrrD7e2 fA0ESdp+sJ5lR1fRjIn4XAvXZDqRNdGvkzaCPNgSRKcAsz+LE1sO8HJZ6iqM3BRJsz 5jycqMz6TJ4hJs5IeHH8nLrAnZz4uip7lFQyYpBQ= From: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= To: "Darrick J. Wong" Cc: Alexander Viro , Christian Brauner , Andrew Morton , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Willy Tarreau , Zhangjin Wu Subject: Re: [PATCH] mm: make MEMFD_CREATE into a selectable config option Message-ID: <534f113b-546b-4795-83a1-b87b67727302@t-8ch.de> References: <20230630-config-memfd-v1-1-9acc3ae38b5a@weissschuh.net> <20230630153236.GD11423@frogsfrogsfrogs> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230630153236.GD11423@frogsfrogsfrogs> X-Rspamd-Queue-Id: 2712E14001B X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: osqjrzgpgurqmmsqtykfb71k4hqkti9p X-HE-Tag: 1688154951-615131 X-HE-Meta: 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 WmkVDlv6 8XCEhe5ENvzz2zmZVd940zFnUkWTg8f5NNQR5pWATYe3zZvJsUDqQ5FCBxwgs9doFVOwb7mPz1k5AcdxLJSLHPVPGCyk4QK3kdmAkzvaVA84vonXk1IERwNRqjs03RYvDmxB8VUppVaLYLjLWFh8P6TOU1wrgmxB1quWA 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 2023-06-30 08:32:36-0700, Darrick J. Wong wrote: > On Fri, Jun 30, 2023 at 11:08:53AM +0200, Thomas Weißschuh wrote: > > The memfd_create() syscall, enabled by CONFIG_MEMFD_CREATE, is useful on > > its own even when not required by CONFIG_TMPFS or CONFIG_HUGETLBFS. > > If you don't have tmpfs or hugetlbfs enabled, then what fs ends up > backing the file returned by memfd_create()? ramfs? ramfs, correct. It goes via mm/memfd.c -> mm/shmem.c -> fs/ramfs/ . Thomas > (Not an objection, I'm just curious...) > > --D > > > Split it into its own proper bool option that can be enabled by users. > > > > Move that option into mm/ where the code itself also lies. > > Also add "select" statements to CONFIG_TMPFS and CONFIG_HUGETLBFS so > > they automatically enable CONFIG_MEMFD_CREATE as before. > > > > Signed-off-by: Thomas Weißschuh > > --- > > fs/Kconfig | 5 ++--- > > mm/Kconfig | 3 +++ > > 2 files changed, 5 insertions(+), 3 deletions(-) > [..]