From patchwork Fri Jun 30 09:08:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 13297835 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 EA30EEB64DA for ; Fri, 30 Jun 2023 09:09:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232361AbjF3JJG (ORCPT ); Fri, 30 Jun 2023 05:09:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231315AbjF3JJC (ORCPT ); Fri, 30 Jun 2023 05:09:02 -0400 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02D9BE5E; Fri, 30 Jun 2023 02:09:01 -0700 (PDT) From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1688116139; bh=OOAKwOFfZgl3msnuVjn16jsWxbjqhfuBBnZpLziJnjI=; h=From:Date:Subject:To:Cc:From; b=nAHp3GNWH3bIQbbJ7B2nTlLTXY9Xq9hWNzqd0TfTgHy3IlpLDeWD+dqQm7O/eXYKH 0K/WErRYqTmvh7xyi3fti32K8jO6hhbiSopGvMb1wcI5VLDlClgpI9DBF50J9KHfdA jEofzwLiPn0IJVU1BBMtLuj1xR1dkREs+FIaJFUk= Date: Fri, 30 Jun 2023 11:08:53 +0200 Subject: [PATCH] mm: make MEMFD_CREATE into a selectable config option MIME-Version: 1.0 Message-Id: <20230630-config-memfd-v1-1-9acc3ae38b5a@weissschuh.net> X-B4-Tracking: v=1; b=H4sIAKSbnmQC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI2MDMyNL3eT8vLTMdN3c1Ny0FN2kVLPENAPjJPOU5EQloJaCotS0zAqwcdG xtbUA9l1O0V4AAAA= To: Alexander Viro , Christian Brauner , Andrew Morton Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Willy Tarreau , Zhangjin Wu , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1688116137; l=2138; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=OOAKwOFfZgl3msnuVjn16jsWxbjqhfuBBnZpLziJnjI=; b=kQBkkRFrqk5TKAAbU2s4iVjeJ2yAWu+HDlzAGyCqAqXUgKoaMED26dyk7Wz3UwkSiKAieqaCN wukedK6JuBXC9N+wJRWyCzBe5NaSB5lv8wz20O/k+hugFZlrp9EiaeA X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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. Signed-off-by: Thomas Weißschuh Tested-by: Zhangjin Wu --- fs/Kconfig | 5 ++--- mm/Kconfig | 3 +++ 2 files changed, 5 insertions(+), 3 deletions(-) --- base-commit: e55e5df193d247a38a5e1ac65a5316a0adcc22fa change-id: 20230629-config-memfd-be6af03b7dca Best regards, diff --git a/fs/Kconfig b/fs/Kconfig index 18d034ec7953..19975b104bc3 100644 --- a/fs/Kconfig +++ b/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_DEFAULT_ON 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 diff --git a/mm/Kconfig b/mm/Kconfig index 09130434e30d..22acffd9009d 100644 --- a/mm/Kconfig +++ b/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