Re: [PATCH RFC 2/2] mm: introdule compound_head_by_tail()

[Peter Zijlstra]

On Mon, Apr 28, 2014 at 11:53:28PM +0800, Jianyu Zhan wrote:
> Actually, I checked the assembled code, the compiler is _not_
> so smart to recognize this case. It just does optimization as
> the hint unlikely() told it.

What version, and why didn't your changelog include this useful
information?
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