Re: [PATCH] drivers/block/xsysace - replacein(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be)

From: Benjamin Herrenschmidt
Date: Mon Feb 11 2013 - 19:26:35 EST

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 ...


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