RE: [PATCH v2 0/2] Simplify mtty driver and mdev core

[Parav Pandit]

Hi Alex,

> -----Original Message-----
> From: linux-kernel-owner@xxxxxxxxxxxxxxx <linux-kernel-
> owner@xxxxxxxxxxxxxxx> On Behalf Of Parav Pandit
> Sent: Saturday, August 24, 2019 9:26 AM
> To: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Cc: Jiri Pirko <jiri@xxxxxxxxxxx>; Jiri Pirko <jiri@xxxxxxxxxxxx>; David S .
> Miller <davem@xxxxxxxxxxxxx>; Kirti Wankhede <kwankhede@xxxxxxxxxx>;
> Cornelia Huck <cohuck@xxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; cjia <cjia@xxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx
> Subject: RE: [PATCH v2 0/2] Simplify mtty driver and mdev core
> > I don't understand this logic.  I'm simply asking that we have a way
> > to test the collision behavior without changing the binary.  The path
> > we're driving towards seems to be making this easier and easier.  If
> > the vendor can request an alias of a specific length, then a sample
> > driver with a module option to set the desired alias length to 1-char makes
> it trivially easy to induce a collision.
> Sure it is easy to test collision, but my point is - mdev core is not sha1 test
> module.
> Hence adding functionality of variable alias length to test collision doesn't
> make sense.
> When the actual user arrives who needs small alias, we will be able to add
> additional pieces very easily.

My initial thoughts to add parent_ops to have bool flag to generate alias or not.
However, instead of bool, keeping it unsigned int to say, zero to skip alias and non-zero length to convey generate alias.
This will serve both the purpose with trivial handling.