On Mon, Jun 30, 2014 at 04:50:47PM +0800, Yan, Zheng wrote:
> event->attr.branch_sample_type is non-zero no matter branch stack
> is enabled explicitly or is enabled implicitly. we can use it to
> replace intel_pmu_needs_lbr_smpl(). This avoids duplicating code
> that implicitly enables the LBR.

How so? I grep'ed for a minute but could not find what you're referring
to.