On Wed, 17 Mar 2021 18:15:27 +0100, Greg KH <greg@xxxxxxxxx> wrote:
Looks like you have mounted tmpfs on top of devtmpfs, which seems very odd. Try unmounting the tmpfs instance and see if the node really is there in devtmpfs. Or better yet, mount devtmpfs somewhere else right now to see if the node is there. Good luck with your userspace mount maze! greg k-h
Ok I finally tracked down what was going on. The embedded distribution I am using uses mdev. mdev has an init script that mounts tmpfs on /dev, which is why devtmpfs wasn't working as expected.
mdev requires the kernel option CONFIG_UEVENT_HELPER=y which was not enabled in my configuration (it even has a scary help description, something along the lines of "this should not be used", so I didn't think to enable it until I saw it mentioned somewhere else). After enabling that, the device file appears under /dev.
Thanks for your help Greg! _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
