<div dir="ltr"> <div class="gmail_extra"> <div class="gmail_quote">On Wed, Nov 23, 2016 at 3:07 PM, Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk" target="_blank">chris@chris-wilson.co.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Just a couple of naked 64bit divides causing link errors on 32bit builds, with: ERROR: "__udivdi3" [drivers/gpu/drm/i915/i915.ko] undefined! v2: do_div() is only u64/u32, we need a u32/u64! v3: div_u64() == u64/u32, div64_u64() == u64/u64 Reported-by: kbuild test robot <<a href="mailto:fengguang.wu@intel.com">fengguang.wu@intel.com</a>> Fixes: d79651522e89 ("drm/i915: Enable i915 perf stream for Haswell OA unit") Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Cc: Robert Bragg <<a href="mailto:robert@sixbynine.org">robert@sixbynine.org</a>> --- drivers/gpu/drm/i915/i915_perf.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c index 95512824922b..14de9a4eee27 100644 --- a/drivers/gpu/drm/i915/i915_perf.c +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -974,8 +974,8 @@ static void i915_oa_stream_disable(struct i915_perf_stream *stream) static u64 oa_exponent_to_ns(struct drm_i915_private *dev_priv, int exponent) { - return 1000000000ULL * (2ULL << exponent) / - dev_priv->perf.oa.timestamp_frequency; + return div_u64(1000000000ULL * (2ULL << exponent), + dev_priv->perf.oa.timestamp_frequency); } static const struct i915_perf_stream_ops i915_oa_stream_ops = { @@ -1051,16 +1051,17 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream, dev_priv->perf.oa.periodic = props->oa_periodic; if (dev_priv->perf.oa.periodic) { - u64 period_ns = oa_exponent_to_ns(dev_priv, - props->oa_period_exponent); + u32 tail; dev_priv->perf.oa.period_exponent = props->oa_period_exponent; /* See comment for OA_TAIL_MARGIN_NSEC for details * about this tail_margin... */ - dev_priv->perf.oa.tail_margin = - ((OA_TAIL_MARGIN_NSEC / period_ns) + 1) * format_size; + tail = div64_u64(OA_TAIL_MARGIN_NSEC, + oa_exponent_to_ns(dev_priv, + props->oa_period_exponent)); + dev_priv->perf.oa.tail_margin = (tail + 1) * format_size; <div class="HOEnZb"><div class="h5"> } if (stream->ctx) { -- 2.10.2 </div></div></blockquote><div> </div><div>This looks good to me, thanks. </div><div>Reviewed-by: Robert Bragg <<a href="mailto:robert@sixbynine.org">robert@sixbynine.org</a>> </div></div> </div></div>