Re: Being more anal about iospace accesses..

[Horst von Brand]

=?iso-8859-1?Q?J=F6rn?= Engel <joern@xxxxxxxxxxxxxxxxxxxx> said:
> On Wed, 15 September 2004 09:30:42 -0700, Linus Torvalds wrote:

[...]

> > For example, if you don't know (or, more importantly - don't care) what 
> > kind of IO interface you use, you can now do something like
> > 
> > 	void __iomem * map = pci_iomap(dev, bar, maxbytes);
> > 	...
> > 	status = ioread32(map + DRIVER_STATUS_OFFSET);

> C now supports pointer arithmetic with void*?

It doesn't. It's a gcc-ism.

>                                               I hope the width of a
> void is not architecture dependent, that would introduce more subtle
> bugs.

gcc takes it as a char pointer for such uses.
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                     Fono: +56 32 654431
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