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
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------------------------------------------------------
From: Thomas WeiÃ?schuh <linux@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx
Signed-off-by: Thomas WeiÃ?schuh <linux@xxxxxxxxxxxxxx>
Tested-by: Zhangjin Wu <falcon@xxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxx are
mm-make-memfd_create-into-a-selectable-config-option.patch
