Fixes for: NFS - the task is blocked at __nfs_lookup_revalidate

JIRA: https://issues.redhat.com/browse/RHEL-117497

We're missing an smp_mb() before waking the waiters - to fix as upstream, we should take most of the series here: https://lore.kernel.org/all/20240826063659.15327-1-neilb@suse.de/

and then the NFS fix from Trond:
1db3a48e83bb NFS: Fix wakeup of __nfs_lookup_revalidate() in unblock_revalidate()

And just to make the bots happy:
Omitted-fix: 7266f0a6d3bb73f42ea06656d3cc48c7d0386f71
... because its not a fix for work here, and we don't maintain bcachefs in RHEL.

Signed-off-by: Benjamin Coddington bcodding@redhat.com