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

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Date:	Wed, 15 Jun 2016 15:21:13 -0400
From:	Waiman Long <waiman.long@....com>
To:	Peter Zijlstra <peterz@...radead.org>
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 06/15/2016 01:40 PM, Peter Zijlstra wrote:
> 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.

Thanks for pointing this out. I will update the changelog to mention 
that the movement is needed because it is going to call 
rwsem_optimistic_spin() in later patch.

Cheers,
Longman