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Date: Fri, 5 May 2017 16:32:46 +0100
From: Will Deacon <will.deacon@arm.com>
To: Yury Norov <ynorov@caviumnetworks.com>
Cc: Peter Zijlstra <peterz@infradead.org>, pan xinhui <mnipxh@hotmail.com>,
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Subject: Re: =?utf-8?B?562U5aSN?= =?utf-8?Q?=3A?= [PATCH 0/3] arm64: queued
 spinlocks and rw-locks
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On Fri, May 05, 2017 at 06:28:45PM +0300, Yury Norov wrote:
> On Fri, May 05, 2017 at 01:26:40PM +0100, Will Deacon wrote:
> > On Fri, May 05, 2017 at 01:53:03PM +0200, Peter Zijlstra wrote:
> > > On Thu, May 04, 2017 at 11:28:09PM +0300, Yury Norov wrote:
> > > > I don't think
> > > > it's a real use case to have ticket spinlocks and queued rwlocks
> > > 
> > > There's nothing wrong with that combination. In fact, we merged qrwlock
> > > much earlier than qspinlock.
> > 
> > ... and that's almost certainly the direction we'll go on arm64 too, not
> > least because the former are a lot easier to grok.
> > 
> > Will
> 
> Hmm. Then I think I have to split patch 3 to rwlock and spinlock
> parts, and allow user to enable them independently in config. 

To be honest, I'm going to spend some time looking at the qrwlock code again
before I enable it for arm64, so I don't think you need to rush to resend
patches since I suspect I'll have a few in the meantime.

Will