Re: proposal for bus_dma(9) change

[David Brownlee <abs%NetBSD.org@localhost>]

On Wed, 4 Mar 2009, Manuel Bouyer wrote:

> On Wed, Mar 04, 2009 at 12:28:15PM +0000, David Brownlee wrote:
> > > How can you find all MD bus_dmamap_create() implementation in whole
> > > MI/MD source tree?
> >
> >         I would suspect by a similar process of finding the calls in
> >         the source tree :)
> >
> >         There are 698 references to bus_dmamap_create through the
> >         tree, 29 are defines, 486 are of the form 'if (bus_dmamap_create'
> >         or 'foo = bus_dmamap_create', and a fair chunk of the rest are
> >         in printfs, comments, or other misc areas.
> >
> >         I'd estimate there would be fewer references to check in the
> >         implementations than the callers.
>
> the problem is that a simple grep doesn't give you all implementations.
> Some of then are referenced though function pointers; finding all of them
> requires more work.

        Going off on a small tangent here - would there be any sane way of
        having code (under DEBUG) which after a bus_space implementation
        is defined would automatically call it with a known bad set of
        parameters and check the return values? Or possibly have a kernel
        module which could do the same? Some form of 'atf for the kernel'?

--
                David/absolute       -- www.NetBSD.org: No hype required --