linux-kernel - Re: [PATCH linux-next v4 5/5] mtd: atmel-quadspi: add driver for Atmel QSPI controller

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Date:	Mon, 24 Aug 2015 13:49:24 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marek Vasut <marex@...x.de>
Cc:	Cyrille Pitchen <cyrille.pitchen@...el.com>, mark.rutland@....com,
	devicetree@...r.kernel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, ben@...adent.org.uk,
	zajec5@...il.com, nicolas.ferre@...el.com,
	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	linux-spi@...r.kernel.org, juhosg@...nwrt.org, broonie@...nel.org,
	linux-mtd@...ts.infradead.org, galak@...eaurora.org,
	shijie.huang@...el.com, computersforpeace@...il.com,
	dwmw2@...radead.org, linux-arm-kernel@...ts.infradead.org,
	beanhuo@...ron.com
Subject: Re: [PATCH linux-next v4 5/5] mtd: atmel-quadspi: add driver for
 Atmel QSPI controller

On Mon, Aug 24, 2015 at 01:03:51PM +0200, Marek Vasut wrote:
> These are functions, not macros :)
> 
> btw is there any reason for these ? I'd say, just put the read*() and
> write*() functions directly into the code and be done with it, it is
> much less confusing.
> 
> Also, why do you use the _relaxed() versions of the functions ?

Now that the _relaxed() accessors are available throughout the kernel,
everyone should be using the _relaxed() versions unless they need the
properties of the non-relaxed versions.  Remember that the non-relaxed
versions are rather expensive on ARM due to the need to go all the way
out to the L2 cache - it at least doubles the number of accesses for
every read*/write*().

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