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SubjectRe: linux-next: build failure after merge of the userns tree
Stephen Rothwell <> writes:

> 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.

Yeah. Al has somethng cooking where he renamed the lock.

It looks like this just needs the trivial change:

Certainly that is all it needed when I closely inspected an earlier
version of Al's changes. He changed the name of the lock and I just
happen to be using it. In this case I don't think any of the semantics
have changed.


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