Merge tag 'driver-core-4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are two small driver core / kernfs fixes for 4.9-rc3.

  One makes the Kconfig entry for DEBUG_TEST_DRIVER_REMOVE a bit more
  explicit that this is a crazy thing to enable for a distro kernel
  (thanks for trying Fedora!), the other resolves an issue with vim
  opening kernfs files (sysfs, configfs, etc.)

  Both have been in linux-next with no reported issues"

* tag 'driver-core-4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: Make Kconfig text for DEBUG_TEST_DRIVER_REMOVE stronger
  kernfs: Add noop_fsync to supported kernfs_file_fops

2 files changed, 5 insertions, 2 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index fdf44cac08e6..d02e7c0f5bfd 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -213,14 +213,16 @@ config DEBUG_DEVRES
           If you are unsure about this, Say N here.
 
 config DEBUG_TEST_DRIVER_REMOVE
-        bool "Test driver remove calls during probe"
+        bool "Test driver remove calls during probe (UNSTABLE)"
         depends on DEBUG_KERNEL
         help
           Say Y here if you want the Driver core to test driver remove functions
           by calling probe, remove, probe. This tests the remove path without
           having to unbind the driver or unload the driver module.
 
-          If you are unsure about this, say N here.
+          This option is expected to find errors and may render your system
+          unusable. You should say N here unless you are explicitly looking to
+          test this functionality.
 
 config SYS_HYPERVISOR
         bool
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 2bcb86e6e6ca..78219d5644e9 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -911,6 +911,7 @@ const struct file_operations kernfs_file_fops = {
         .open           = kernfs_fop_open,
         .release        = kernfs_fop_release,
         .poll           = kernfs_fop_poll,
+        .fsync          = noop_fsync,
 };
 
 /**