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SubjectRe: user space writel() etc. in 2.2.2
Date
> Alpha + sparse memory + mmap'ed frame buffer + mmap'ed control
> registers.
>
> I am not that familiar with the sparse mem but I doubt mmap() has a
> kludge to get around it (I found out the hard way why readl/writel is
> needed when porting the AceNIC driver to run an Avanti).

The Alpha functions sometimes use a kernel jump table. Im sure thats really
going to work well from user space. The moment you go digging into devices
directly from user space you lose portability.

Alan


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