linux-kernel - Re: [PATCH] drivers/block/xsysace - replace in(out)_8/in(out)_be16/in(out)

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Date:	Tue, 12 Feb 2013 11:25:26 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Michal Simek <monstr@...str.eu>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	dahinds@...rs.sourceforge.net
Subject: Re: [PATCH] drivers/block/xsysace - replace
 in(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be)

On Mon, 2013-02-11 at 16:57 +0100, Michal Simek wrote:
> But it reminds me that maybe the easiest solution is not to use endian
> accessors just use two simple macros which should work on all systems.
> 
> #define <name>_readreg(offset)          ({__raw_readl(offset); rmb(); })
> #define <name>_writereg(offset, val)    ({wmb(); __raw_writel(val, offset); })
> 
> which is probably the faster solution which add minimum additional code
> to driver and can also remove endian detection code.

Except that rmb & wmb might not be the right barriers for IOs ...

Cheers,
Ben.


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