Merge tag 'v3.11-rc5' into for-3.12 branch

For testing purposes I want some nfs and nfsd bugfixes (specifically,
58cd57bfd9db3bc213bf9d6a10920f82095f0114 and previous nfsd patches, and
Trond's 4f3cc4809a98a165a9708b72b47de71643797bbd).