Re: [Xen-devel] [PATCH v4 13/15] systemd: add xen systemd service and module files

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-05-12 at 11:46 -0700, Luis R. Rodriguez wrote:
> On Mon, May 12, 2014 at 7:11 AM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> 
> wrote:
> > (In theory we shouldn't need manual module loading, but it seems that
> > failure to load module bugs continue to exist in Linux.)
> 
> Once I'm done with systemd I'm going to jump on the kernel and would
> like to know exactly which modules there is an issue for on this. Do
> you have pointers?

The list you have in this patch is a pretty good start.

But one thing to remember is that this needs to handle not just the
current kernel (which may have many of these bugs fixed) but also older
distro kernels which may still have them. Figuring out which is which
would be some serious archeology, and even then it's not clear what
could be done with the knowledge, perhaps annotate this list with the
oldest kernel/distro which doesn't autoload and prune as we move the
support window forward.

Also some of these drivers might suffer the same sort of issue as
loop.ko, which is that there is no obvious trigger for when to load them
i.e. there's no bus, and the old "open /dev/loop and have the driver
loaded approach no longer works since udev was introduced.

Ian.


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