CVS tag for specific release candidate

[Luke Dean]

I was using 5.4-RC1 until today.
Today I attempted to update to 5.4, but I can't get into single-user mode 
without a panic.  I'm just about certain that this is because of the work 
in progress in that ata-raid driver right now.
I'm using a Promise FastTrack S150 TX2Plus, and it's not happy with the 
recent changes.  I'd be glad to help test the changes, but right now I'm 
more concerned with getting my system in a stable shape.
I want to go back to 5.4-RC1, but I can't seem to get the CVS tag right.