Re: [PATCH 2/3] dummy: make device count build-time configurable

Hi Stephen,

On Tue, 2016-01-12 at 10:42 -0800, Stephen Hemminger wrote:

On Tue, 12 Jan 2016 12:57:33 +0100
Lubomir Rintel [off-list ref] wrote:

quoted

The devices can be created at run-time for quite some time already
and the
load-time device creation collides with attempts to create the
device of
the same name:

  # rmmod dummy
  # ip link add dummy0 type dummy
  RTNETLINK answers: File exists

This is pretty much the same situation as was with the block loop
devices
which was solved by adding a build-time configuration that the
distributions could use as they deem fit while keeping the default
for
compatibility.

Let's do that here as well.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

There is already a module parameter for this, so making it a compile
time option adds nothing.

This option changes the defaults for the parameter.

When the module gets autoloaded, the user doesn't get a chance to
specify the module parameter and unwanted devices pop in.

Worse even, the automatically created devices are likely to collide
with what the user asked for.

Lubo