On Tue, Oct 31, 2017 at 04:45:46PM +0100, Michal Hocko wrote: > Anyway, this lock dependecy is subtle as hell and I am worried that we > might have way too many of those. We have so many callers of > get_online_cpus that dependecies like this are just waiting to blow up. Yes, the filesystem locks inside hotplug thing is totally annoying. I've got a few other splats that contain a similar theme and I've no real clue what to do about. See for instance this one: https://lkml.kernel.org/r/20171027151137.GC3165@worktop.lehotels.local splice from devtmpfs is another common theme and links it do the pipe->mutex, which then makes another other splice op invert against that hotplug crap :/ I'm sure I've suggested simply creating possible_cpus devtmpfs files up front to get around this... maybe we should just do that. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
