[Intel-gfx] [PATCH] drm/i915/lrc: Remove superfluous WARN_ON

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-01-26 11:49:01)
> 
> On 26/01/2018 09:35, Chris Wilson wrote:
> > Remove the WARN_ON(ce->state) inside the static function only called
> > when ce->state == NULL and downgrade the w/a batch setup warning into a
> > developer only mode (GEM_WARN_ON).
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > ---
> >   drivers/gpu/drm/i915/intel_lrc.c | 5 ++---
> >   1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> > index 1a3174371c8e..50b37bf3682a 100644
> > --- a/drivers/gpu/drm/i915/intel_lrc.c
> > +++ b/drivers/gpu/drm/i915/intel_lrc.c
> > @@ -1419,7 +1419,8 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
> >        */
> >       for (i = 0; i < ARRAY_SIZE(wa_bb_fn); i++) {
> >               wa_bb[i]->offset = batch_ptr - batch;
> > -             if (WARN_ON(!IS_ALIGNED(wa_bb[i]->offset, CACHELINE_BYTES))) {
> > +             if (GEM_WARN_ON(!IS_ALIGNED(wa_bb[i]->offset,
> > +                                         CACHELINE_BYTES))) {
> >                       ret = -EINVAL;
> >                       break;
> >               }
> > @@ -2271,8 +2272,6 @@ static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
> >       struct intel_ring *ring;
> >       int ret;
> >   
> > -     WARN_ON(ce->state);
> > -
> 
> Call path is a bit messy, maybe this would be better left as 
> GEM_WARN_ON, return -Esomething?

Caller is a straight if (!ce->state) deferred_alloc().

GEM_BUG_ON() at most, but since this is all static, it just looks
superfluous. Maybe just move the guard here and let the compiler sort it
out.
-Chris