On Thu, Mar 10, 2022 at 11:34:40AM +0000, Luca Porzio (lporzio) wrote:

I work for Micron UFS team. I confirm and support Manjong message above.
There are UFS customers using custom write_hint in Android and due to the 
"upstream first" policy from Google, if you remove write_hints in block device,
The Android ecosystem will suffer this lack.

Can we revert back this decision? Or think of an alternative solution which 
may work?

Hell no.  Given that these custmomers never gave a singe fuck to actually
support whatever crap they came up with upstream we're not going to leave
dead code to encurage them to keep doing this.