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 CF6FFEB64D9 for ; Sun, 2 Jul 2023 18:50:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229706AbjGBSuO (ORCPT ); Sun, 2 Jul 2023 14:50:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229608AbjGBSuN (ORCPT ); Sun, 2 Jul 2023 14:50:13 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60543C3 for ; Sun, 2 Jul 2023 11:50:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D3F7F60C77 for ; Sun, 2 Jul 2023 18:50:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32EBDC433C7; Sun, 2 Jul 2023 18:50:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1688323811; bh=QbIymBbhRrCVuMQINnyhmGPCotr3c0BQvzGqKGRn5Zg=; h=Date:To:From:Subject:From; b=fhqv2HG8PYomyBGNKef9AesdM2/bBFAZGs8dZEV49Tw9ru6qJ1wdoAsxzpuepjpGp /kUD07/iiI2ecliV2qIwd8EvLsUZ6i0IivNLk6AkcrfTkoxsYd/z9wfBje1cql+uvI t76Haz8Hz1LBkAyAQoulejSCifTlSeSYsYfrjLBI= Date: Sun, 02 Jul 2023 11:50:10 -0700 To: mm-commits@vger.kernel.org, viro@zeniv.linux.org.uk, falcon@tinylab.org, djwong@kernel.org, brauner@kernel.org, linux@weissschuh.net, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-make-memfd_create-into-a-selectable-config-option.patch added to mm-unstable branch Message-Id: <20230702185011.32EBDC433C7@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm: make MEMFD_CREATE into a selectable config option has been added to the -mm mm-unstable branch. Its filename is mm-make-memfd_create-into-a-selectable-config-option.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-make-memfd_create-into-a-selectable-config-option.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Thomas Weißschuh Subject: mm: make MEMFD_CREATE into a selectable config option Date: Fri, 30 Jun 2023 11:08:53 +0200 The memfd_create() syscall, enabled by CONFIG_MEMFD_CREATE, is useful on its own even when not required by CONFIG_TMPFS or CONFIG_HUGETLBFS. 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. Link: https://lkml.kernel.org/r/20230630-config-memfd-v1-1-9acc3ae38b5a@weissschuh.net Signed-off-by: Thomas Weißschuh Tested-by: Zhangjin Wu Cc: Al Viro Cc: Christian Brauner Cc: Darrick J. Wong Signed-off-by: Andrew Morton --- fs/Kconfig | 5 ++--- mm/Kconfig | 3 +++ 2 files changed, 5 insertions(+), 3 deletions(-) --- a/fs/Kconfig~mm-make-memfd_create-into-a-selectable-config-option +++ a/fs/Kconfig @@ -169,6 +169,7 @@ source "fs/sysfs/Kconfig" config TMPFS bool "Tmpfs virtual memory file system support (former shm fs)" depends on SHMEM + select MEMFD_CREATE help Tmpfs is a file system which keeps all files in virtual memory. @@ -240,6 +241,7 @@ config HUGETLBFS bool "HugeTLB file system support" depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN depends on (SYSFS || SYSCTL) + select MEMFD_CREATE help hugetlbfs is a filesystem backing for HugeTLB pages, based on ramfs. For architectures that support it, say Y here and read @@ -264,9 +266,6 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEF enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off (boot command line) or hugetlb_optimize_vmemmap (sysctl). -config MEMFD_CREATE - def_bool TMPFS || HUGETLBFS - config ARCH_HAS_GIGANTIC_PAGE bool --- a/mm/Kconfig~mm-make-memfd_create-into-a-selectable-config-option +++ a/mm/Kconfig @@ -1144,6 +1144,9 @@ config KMAP_LOCAL_NON_LINEAR_PTE_ARRAY config IO_MAPPING bool +config MEMFD_CREATE + bool "Enable memfd_create() system call" if EXPERT + config SECRETMEM default y bool "Enable memfd_secret() system call" if EXPERT _ Patches currently in -mm which might be from linux@weissschuh.net are mm-make-memfd_create-into-a-selectable-config-option.patch