Hi Eric,

After merging the userns tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

fs/namespace.c: In function 'detach_mounts':
fs/namespace.c:1340:2: error: implicit declaration of function 'br_write_lock' [-Werror=implicit-function-declaration]
  br_write_lock(&vfsmount_lock);
  ^
fs/namespace.c:1340:17: error: 'vfsmount_lock' undeclared (first use in this function)
  br_write_lock(&vfsmount_lock);
                 ^
fs/namespace.c:1340:17: note: each undeclared identifier is reported only once for each function it appears in
fs/namespace.c:1345:2: error: implicit declaration of function 'br_write_unlock' [-Werror=implicit-function-declaration]
  br_write_unlock(&vfsmount_lock);
  ^

Caused by the interaction between commit d7e58b8abc4f ("vfs: Add a
function to lazily unmount all mounts from any dentry. v3") from the
userns tree and commit 84550b9356af ("RCU'd vfsmounts") from the vfs tree.

I don't know how to fix this up, so I have just dropped the userns tree
for today.  I only dropped that tree because it was the latter of the two
conflicting trees.

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au