On Fri, Sep 13, 2013 at 01:14:06PM +0200, Michael Biebl wrote:
> Am 13.09.2013 05:50, schrieb Norbert Preining:
> > On Fr, 13 Sep 2013, Norbert Preining wrote:
> >> * second, what about the udev maintainers specify what changes
> >> to self compiled kernels are necessary when upgrading udev.
> >
> > For those coming here in search of help:
> > CONFIG_DEVTMPFS=y
> > CONFIG_DEVTMPFS_MOUNT=y (might not be necessary, not sure)
>
> As I wrote earlier, CONFIG_DEVTMPFS=y is mandatory now and it needs
> something which mounts the devtmps. Usually it is done by the initramfs
> (in Debian both dracut and initramfs-tools work fine) and if you don't
> use and initramfs for whatever reason, you'll need
> CONFIG_DEVTMPFS_MOUNT=y, so the kernel mounts the devtmpfs for you.
Note that /etc/init.d/udev chacks for tmpfs to be mounted on / and
mounts it, if not. If you change this to check for and mount devtmpfs,
it still works without CONFIG_DEVTMPFS_MOUNT, only CONFIG_DEVTMPFS is
still needed.
This should increase compatibility with a number of self-compiled
kernels, since the kernel default for CONFIG_DEVTMPFS_MOUNT still seems
to be "No". You also could suggest to set devtmpfs.mount=1 on the kernel
commandline instead.
Ingo
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