linux-kernel - Re: [PATCH v2 20/28] ARCv2: barriers

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Message-ID: <20150623092506.GP19282@twins.programming.kicks-ass.net>
Date:	Tue, 23 Jun 2015 11:25:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	arc-linux-dev@...opsys.com, Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v2 20/28] ARCv2: barriers

On Tue, Jun 23, 2015 at 01:28:03PM +0530, Vineet Gupta wrote:
> +/*
> + * MMIO can also get buffered/optimized in micro-arch, so barriers needed
> + * Based on ARM model for the typical use case
> + *
> + *	<writel_relaxed DMA buffer>
> + *	<writel MMIO "go" reg>
> + *   or:
> + *   	<readl MMIO "status" reg>
> + *   	<readl_relaxed DMA buffer>
> + *
> + * http://www.spinics.net/lists/kernel/msg2018397.html

	http://lkml.kernel.org/r/20150622133656.GG1583@arm.com

Might I suggest you use the above link. Since we control kernel.org we
have redirect that URL to a archive of our choosing. This keeps the
links working even if spinics.net or marc.info were to go belly up.
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