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When CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) claims success, but did not actually clone a new IPC namespace. Fix this to return -EINVAL so the caller knows his request was denied. Signed-off-by: Serge E. Hallyn <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>