linux-kernel - [PATCH] mm/Kconfig: Make userfaultfd a menuconfig

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Message-ID: <20231123224204.1060152-1-peterx@redhat.com>
Date:   Thu, 23 Nov 2023 17:42:04 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, peterx@...hat.com
Subject: [PATCH] mm/Kconfig: Make userfaultfd a menuconfig

PTE_MARKER_UFFD_WP is a subconfig for userfaultfd.  To make it clear,
switch to use menuconfig for userfaultfd.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/Kconfig | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 89971a894b60..57cd378c73d6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1201,13 +1201,6 @@ 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
@@ -1218,6 +1211,14 @@ config HAVE_ARCH_USERFAULTFD_MINOR
 	help
 	  Arch has userfaultfd minor fault support
 
+menuconfig 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.
+
+if USERFAULTFD
 config PTE_MARKER_UFFD_WP
 	bool "Userfaultfd write protection support for shmem/hugetlbfs"
 	default y
@@ -1227,6 +1228,7 @@ config PTE_MARKER_UFFD_WP
 	  Allows to create marker PTEs for userfaultfd write protection
 	  purposes.  It is required to enable userfaultfd write protection on
 	  file-backed memory types like shmem and hugetlbfs.
+endif # USERFAULTFD
 
 # multi-gen LRU {
 config LRU_GEN
-- 
2.41.0