Re: [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack

[Namhyung Kim]

Hi,

On Wed, 24 Oct 2012 13:59:10 +0800, Zheng Yan wrote:
> From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
>
> Zero length calls may confuse the hardware and make the recorded
> call stack incorrect. Try fixing the call stack by discarding
> zero length call entries.

It would be great adding an explanation what is the "zero length call"
and why it makes a confusion.

Thanks,
Namhyung
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