linux-kernel - Re: [PATCH] arch: Introduce read

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Message-Id: <20141112.154341.1705628294274955796.davem@davemloft.net>
Date:	Wed, 12 Nov 2014 15:43:41 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	alexander.h.duyck@...hat.com
Cc:	will.deacon@....com, alexander.duyck@...il.com,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mikey@...ling.org, tony.luck@...el.com,
	mathieu.desnoyers@...ymtl.ca, peterz@...radead.org,
	benh@...nel.crashing.org, heiko.carstens@...ibm.com,
	oleg@...hat.com, michael@...erman.id.au, geert@...ux-m68k.org,
	fweisbec@...il.com, schwidefsky@...ibm.com, linux@....linux.org.uk,
	paulmck@...ux.vnet.ibm.com, torvalds@...ux-foundation.org,
	mingo@...nel.org
Subject: Re: [PATCH] arch: Introduce read_acquire()

From: Alexander Duyck <alexander.h.duyck@...hat.com>
Date: Tue, 11 Nov 2014 13:12:32 -0800

> The architectures I need to sort out are arm, x86, sparc, ia64, and
> s390 as they are the only ones that tried to make use of the
> smp_load_acquire logic.

On sparc64, you don't have to worry about anything really.

Only mb() does anything.  The cpus execute in a reasonably strict
memory ordering mode, and that's why rmb/wmb and friends are simply
nops with a compiler barrier.
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