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mm/uffd: move USERFAULTFD configs into mm/

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We used to have USERFAULTFD configs stored in init/.  It makes sense as a
start because that's the default place for storing syscall related
configs.

However userfaultfd evolved a bit in the past few years and some more
config options were added.  They're no longer related to syscalls and
start to be not suitable to be kept in the init/ directory anymore,
because they're pure mm concepts.

But it's not ideal either to keep the userfaultfd configs separate from
each other.  Hence this patch moves the userfaultfd configs under init/ to
be under mm/ so that we'll start to group all userfaultfd configs
together.

We do have quite a few examples of syscall related configs that are not
put under init/Kconfig: FTRACE_SYSCALLS, SWAP, FILE_LOCKING,
MEMFD_CREATE..  They all reside in the dir where they're more suitable for
the concept.  So it seems there's no restriction to keep the role of
having syscall related CONFIG_* under init/ only.

Link: https://lkml.kernel.org/r/20220420144823.35277-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2022-05-12 20:22:56 -07:00 committed by Andrew Morton
parent 1bf0831383
commit 430529b5c6
2 changed files with 17 additions and 17 deletions
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17
init/Kconfig
View file

@ -1667,16 +1667,6 @@ config ADVISE_SYSCALLS
applications use these syscalls, you can disable this option to save
space.
config HAVE_ARCH_USERFAULTFD_WP
bool
help
Arch has userfaultfd write protection support
config HAVE_ARCH_USERFAULTFD_MINOR
bool
help
Arch has userfaultfd minor fault support
config MEMBARRIER
bool "Enable membarrier() system call" if EXPERT
default y
@ -1741,13 +1731,6 @@ config KALLSYMS_BASE_RELATIVE
# syscall, maps, verifier
config USERFAULTFD
bool "Enable userfaultfd() system call"
depends on MMU
help
Enable the userfaultfd() system call that allows to intercept and
handle page faults in userland.
config ARCH_HAS_MEMBARRIER_CALLBACKS
bool

17
mm/Kconfig
View file

@ -909,6 +909,23 @@ config ANON_VMA_NAME
area from being merged with adjacent virtual memory areas due to the
difference in their name.
config USERFAULTFD
bool "Enable userfaultfd() system call"
depends on MMU
help
Enable the userfaultfd() system call that allows to intercept and
handle page faults in userland.
config HAVE_ARCH_USERFAULTFD_WP
bool
help
Arch has userfaultfd write protection support
config HAVE_ARCH_USERFAULTFD_MINOR
bool
help
Arch has userfaultfd minor fault support
config PTE_MARKER
bool