linux-kernel - Re: [RFC PATCH-tip v2 4/6] locking/rwsem: move down rwsem_down_read

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Message-ID: <20160615174055.GS30921@twins.programming.kicks-ass.net>
Date:	Wed, 15 Jun 2016 19:40:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-alpha@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-arch@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
	Jason Low <jason.low2@...com>,
	Dave Chinner <david@...morbit.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>
Subject: Re: [RFC PATCH-tip v2 4/6] locking/rwsem: move down
 rwsem_down_read_failed function

On Tue, Jun 14, 2016 at 06:48:07PM -0400, Waiman Long wrote:
> Move the rwsem_down_read_failed() function down to below the optimistic
> spinning section before enabling optimistic spinning for the readers.

newline

> There is no change in code.

Changelog fails to explain the why part.