On Tue, Oct 16, 2018 at 03:29:38PM +0300, Jani Nikula wrote: > Clang build with UBSAN enabled leads to the following build error: > > drivers/gpu/drm/i915/intel_engine_cs.o: In function `intel_engine_init_execlist': > drivers/gpu/drm/i915/intel_engine_cs.c:411: undefined reference to `__compiletime_assert_411' > > Again, for this to work the code would first need to be inlined and then > constant folded, which doesn't work for Clang because semantic analysis > happens before optimization/inlining. > > Use GEM_BUG_ON() instead of BUILD_BUG_ON(). > > v2: Use is_power_of_2() from log2.h (Chris) > > References: http://mid.mail-archive.com/20181015203410.155997-1-swboyd@xxxxxxxxxxxx > Reported-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> > Cc: Stephen Boyd <swboyd@xxxxxxxxxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- Tested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > drivers/gpu/drm/i915/intel_engine_cs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c > index f27dbe26bcc1..bc793b0c8806 100644 > --- a/drivers/gpu/drm/i915/intel_engine_cs.c > +++ b/drivers/gpu/drm/i915/intel_engine_cs.c > @@ -466,7 +466,7 @@ static void intel_engine_init_execlist(struct intel_engine_cs *engine) > struct intel_engine_execlists * const execlists = &engine->execlists; > > execlists->port_mask = 1; > - BUILD_BUG_ON_NOT_POWER_OF_2(execlists_num_ports(execlists)); > + GEM_BUG_ON(!is_power_of_2(execlists_num_ports(execlists))); > GEM_BUG_ON(execlists_num_ports(execlists) > EXECLIST_MAX_PORTS); > > execlists->queue_priority = INT_MIN; > -- > 2.11.0 > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
