RE: [PATCH v1 1/5] IB/uverbs: ex_query_device: answer must not depend on request's comp_mask

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> 
> On Thu, Jan 29, 2015 at 09:50:38PM +0100, Yann Droneaud wrote:
> 
> > Anyway, I recognize that uverb way of abusing write() syscall is
> > borderline (at best) regarding other Linux subsystems and Unix
> > paradigm in general. But it's not enough to screw it more.
> 
> Then we must return the correct output size explicitly in the struct.

I was thinking this very same thing as I read through this thread.

I too would like to avoid the use of comp_masks if at all possible.  The query call seems to be a verb where the structure size is all you really need to know the set of values returned.

As Jason says, other calls may require the comp_mask where 0 is not sufficient to indicate "missing".

Ira

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