[Qemu-devel] [PATCH 18/23] userfaultfd: buildsystem activation

[Andrea Arcangeli]

This allows to select the userfaultfd during configuration to build it.

Signed-off-by: Andrea Arcangeli <address@hidden>
---
 fs/Makefile  |  1 +
 init/Kconfig | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/fs/Makefile b/fs/Makefile
index cb92fd4..53e59b2 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_ANON_INODES)     += anon_inodes.o
 obj-$(CONFIG_SIGNALFD)         += signalfd.o
 obj-$(CONFIG_TIMERFD)          += timerfd.o
 obj-$(CONFIG_EVENTFD)          += eventfd.o
+obj-$(CONFIG_USERFAULTFD)      += userfaultfd.o
 obj-$(CONFIG_AIO)               += aio.o
 obj-$(CONFIG_FS_DAX)           += dax.o
 obj-$(CONFIG_FILE_LOCKING)      += locks.o
diff --git a/init/Kconfig b/init/Kconfig
index 88ad043..e1c9d9e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1644,6 +1644,17 @@ config ADVISE_SYSCALLS
          applications use these syscalls, you can disable this option to save
          space.
 
+config USERFAULTFD
+       bool "Enable userfaultfd() system call"
+       select ANON_INODES
+       default y
+       depends on MMU
+       help
+         Enable the userfaultfd() system call that allows to intercept and
+         handle page faults in userland.
+
+         If unsure, say Y.
+
 config PCI_QUIRKS
        default y
        bool "Enable PCI quirk workarounds" if EXPERT