Quoting Andi Shyti (2019-03-11 10:30:23)
> Hi again,
> 
> I was thinking...
> 
> > +static void bonded(int i915, unsigned int flags)
> > +#define CORK 0x1
> > +{
> > +     struct class_instance *master_engines;
> 
> ... shall we just make 'struct class_instance' generic in the
> uapi? I do not expect every test that uses class and instance to
> define its own structure.

But this test is defining its own struct ;)

> Besides we can avoid a good load of 'offsetof' and make the whole
> thing more readable.

Maybe stop using uAPI structs for library structs -- it's not a good
strategy long term. (We only need the uAPI for interfacing, but for the
library we tend to want other details such as mmio_base, name, etc)

Using offsetof to define the size is reasonably common practice for
variable length arrays (except unless you are paranoid about overflow in
every step of the computation).
-Chris
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