linux-kernel - Re: [PATCH 2/4] arch: Add lightweight memory barriers fast_rmb() and fast

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Message-ID: <1416271305.18381.19.camel@kernel.crashing.org>
Date:	Tue, 18 Nov 2014 11:41:45 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alexander Duyck <alexander.h.duyck@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Peter Zijlstra <peterz@...radead.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Michael Neuling <mikey@...ling.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	donald.c.skidmore@...el.com, matthew.vick@...el.com,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	nic_swsd@...ltek.com, Will Deacon <will.deacon@....com>,
	Michael Ellerman <michael@...erman.id.au>,
	Tony Luck <tony.luck@...el.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 2/4] arch: Add lightweight memory barriers fast_rmb()
 and fast_wmb()

On Mon, 2014-11-17 at 12:52 -0800, Linus Torvalds wrote:

> Maybe "dma_*mb()" would be acceptable, and ends up having the same
> naming convention as "smb_*mb()", and explains what it's about.

Yes, that was what I was about to suggest as well.

> And yes, in the same spirit, it would probably be good to try to
> eventually get rid of the plain "*mb()" functions, and perhaps call
> them "mmio_*mb()" to clarify that they are about ordering memory wrt
> mmio.

It will always be somewhat unclear to users who don't read the doc
anyway :)

IE. the dma_* ones do only DMA vs DMA (or vs other processors) but the 
mmio_* one do anything vs anything. Not a huge deal tho. I still like
dma_* for Alexander's new stuff but I wouldn't bother with changing the
existing ones.

Ben.


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