From: "Thomas Weißschuh" <linux@weissschuh.net>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, "Willy Tarreau" <w@lwt.eu>,
"Zhangjin Wu" <falcon@tinylab.org>,
"Thomas Weißschuh" <linux@weissschuh.net>
Subject: [PATCH] mm: make MEMFD_CREATE into a selectable config option
Date: Fri, 30 Jun 2023 11:08:53 +0200 [thread overview]
Message-ID: <20230630-config-memfd-v1-1-9acc3ae38b5a@weissschuh.net> (raw)
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 <linux@weissschuh.net>
---
fs/Kconfig | 5 ++---
mm/Kconfig | 3 +++
2 files changed, 5 insertions(+), 3 deletions(-)
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
---
base-commit: e55e5df193d247a38a5e1ac65a5316a0adcc22fa
change-id: 20230629-config-memfd-be6af03b7dca
Best regards,
--
Thomas Weißschuh <linux@weissschuh.net>
next reply other threads:[~2023-06-30 9:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-30 9:08 Thomas Weißschuh [this message]
2023-06-30 13:38 ` [PATCH] mm: make MEMFD_CREATE into a selectable config option Zhangjin Wu
2023-06-30 15:32 ` Darrick J. Wong
2023-06-30 19:55 ` Thomas Weißschuh
2023-07-03 22:48 ` Mike Kravetz
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