Re: [PATCH] C undefined behavior fix

From: Laurent Guerby (
Date: Sun Jan 06 2002 - 14:27:34 EST

> In the Linux case mmio isn't a problem. The rules for mmio in the portable
> code require you use architecture dependant macros (readb etc) and that
> the mmio space is mapped via ioremap.

I haven't done my homework, but I assume the code behind readb use inline
assembly and not C on most platforms?

May be GNU C could get some of the idea behind the Linux macros
to define the needed extension (portable within GNU C architectures
wherever possible).

Laurent Guerby <>

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