On Tue, Jun 13, 2017 at 09:13:32PM +0200, Sven-Haegar Koch wrote: > On Tue, 13 Jun 2017, Greg Kroah-Hartman wrote: > > > On Tue, Jun 13, 2017 at 10:25:40AM -0600, Logan Gunthorpe wrote: > > > > > > On 12/06/17 10:35 PM, Greg Kroah-Hartman wrote: > > > > Or better yet, just turn all char major allocations into dynamic, which > > > > would be really good for test systems. I thought someone proposed > > > > patches for that a long time ago, but I can't find them anymore. That > > > > would be the simplest solution here. > > > > > > Would people not complain about that? I would not be surprised if some > > > crazy application is using hard coded major numbers in userspace. So > > > such a change could potentially break userspace... > > > > For char devices, I doubt it, but we can't take the chance, which is why > > you make it an option. Then, it's enabled for 'allmodconfig' builds, > > which helps testers out. > > At least for /dev/null, /dev/zero, and perhaps /dev/tty it would > definitely break things if the major+minor number is not static. I have > multiple chroot environments having only some minimal needed static > /dev subdir, with naturally no daemons or filesystem creating those > on-demand. For the main /dev I use whatever the system sets up, so > devtmpfs with udev. No, it wouldn't be required, it would be an option for those people using devtmpfs. thanks, greg k-h
