Re: [RFC 5/5] pm: remove kernel thread freezing

From: Bart Van Assche
Date: Tue Oct 03 2017 - 16:22:11 EST

On Tue, 2017-10-03 at 22:17 +0200, Jiri Kosina wrote:
> On Tue, 3 Oct 2017, Bart Van Assche wrote:
> > What about the many drivers outside filesystems that use the
> > set_freezable() / try_to_freeze() / wait_event_freezable() API?
> Many/most of them are just completely bogus and pointless. I've killed a
> lot of those in the past, but the copy/paste programming is just too
> strong enemy to fight against.

If just a single driver would use that API to prevent that I/O occurs while
processes are frozen then this patch will break that driver. I would like to
know your opinion about the following patch in particular: "[PATCH v4 1/7] md:
Make md resync and reshape threads freezable"