netdev - Re: [PATCH v2] netlink: Replace rhash

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Message-ID: <20150922195059.GF17659@mtj.duckdns.org>
Date:	Tue, 22 Sep 2015 15:50:59 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>,
	Cong Wang <cwang@...pensource.com>, tom@...bertland.com,
	kafai@...com, kernel-team@...com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Jiří Pírko <jiri@...nulli.us>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Thomas Graf <tgraf@...g.ch>, Scott Feldman <sfeldma@...il.com>
Subject: Re: [PATCH v2] netlink: Replace rhash_portid with bound

Hello,

On Tue, Sep 22, 2015 at 12:28:45PM -0700, Linus Torvalds wrote:
> Both acquire and smp_rmb() are equally free on x86.

Was this always like this?  Ah, okay, from 2007.  Was thinking it's
still doing an actual rmb.  Talk about being confused.

> It appears that we don't do the X86_PPRO_FENCE bug handling for
> acquire, but I guess we should.

Hmmm?  We're doing that.  PPRO_FENCE makes both acquire and release
use smp_mb().

Thanks.

-- 
tejun
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