On Fri, Dec 09, 2016 at 04:31:50PM +0200, Joonas Lahtinen wrote:
> On pe, 2016-12-09 at 13:08 +0000, Chris Wilson wrote:
> > +static int igt_reserve(void *ignored)
> > +{
> > + int n, ret;
> > +
> > + for (n = 1; n < 50; n++) {
>
> The right amount of loops might be something to discuss.
The looping here is for all power-of-two (+-1 to catch the usual
interesting boundary conditions) upto total size == 1<<63 (a little room
to spare). So these I regard as exercising the likely errors, with the
looping inside being subject to discussion. Certainly also probably nice
to run through with primes as well (though we have a few mersenne primes
in this set, so that's probably overkill).
On top of these we also want to think how much error handling we want
inside drm_mm_node_reserve() and add the broken usage.
> > + ret = __igt_reserve(8192, (1ull << n) - 1);
>
> BIT_ULL(n) - 1?
Considered it, but felt calling it BIT was misleading / distraction.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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