linux-kernel - Re: [PATCH RFC 2/2] mm: introdule compound_head_by

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Message-ID: <20140428155540.GJ27561@twins.programming.kicks-ass.net>
Date:	Mon, 28 Apr 2014 17:55:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jianyu Zhan <nasa4836@...il.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kirill.shutemov@...ux.intel.com, Rik van Riel <riel@...hat.com>,
	Jiang Liu <liuj97@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>, sasha.levin@...cle.com,
	liwanp@...ux.vnet.ibm.com, khalid.aziz@...cle.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 2/2] mm: introdule compound_head_by_tail()

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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