Request to apply 6d3e0d8cc632 to stable kernels

Hi,

May I request this be ported to stable kernels?

6d3e0d8cc632 ("kdb: Do not assume write() callback available")

It landed in v6.6, and I've tested the trivial cherry-pick to v6.1.y. AFAICT, it makes sense and applies cleanly to at least v5.15.y and v5.10.y (and possibly more), although I didn't test those.

It's a bit of an older (but trivial) fix, and I assume not many folks actually test out KDB/KGDB that often, but I wasted my time re-discovering it.

Thanks, Brian