It's missing a stable tag only because I initially committed it
without confirmation from the reporter that it actually fixed the
problem. I did that because I didn't think I'd get a test result back
on a Sunday before doing rc4.
But the reporter came back and confirmed it fixed things, and because
I hadn't pushed out yet, I amended the commit to have that
"Reported-and-tested-by".
... but I didn't think to add the Cc: stable until after I _had_ pushed it out.
So here's a slightly belated note that commit
feb889fb40fafc6933339cf1cca8f770126819fb
("mm: don't put pinned pages into the swap cache")
should go into any v5.9+ stable kernels.
Linus
