Backport d4ae9916ea29 ("mm: soft-offline: close the race against page allocation") to 4.14 and 4.9

Hi all,

I wonder if there was an attempt to backport d4ae9916ea29 ("mm: soft-offline: close the race against page allocation") from 4.19 to 4.14 and 4.9 (patch does not apply, haven't found anything on stable ML, nor in stable tree git, therefore I assume it was left as not easily fixable).

I'm asking because William is writing a LTP test madvise11 [1] which shows it's failing on 4.14.290 (the latest 4.14). I know that 4.9 EOL in 4 months, but 4.14 in Jan 2024, it might be worth to fix it at least for 4.14.

Kind regards, Petr

[1] https://lore.kernel.org/ltp/1659975072-29808-1-git-send-email-william.roche@...