Re: pci-sysfs resource mmap broken (and PATCH)

From: David S. Miller
Date: Fri Apr 29 2005 - 10:53:53 EST

On Thu, 28 Apr 2005 17:38:28 -0600
Grant Grundler <grundler@xxxxxxxxxxxxxxxx> wrote:

> I suspect the MAP_* attribute/hint needs to be passed in together
> with the mmap call if any arch (ia64?) would return a different
> virtual address depending the attribute (e.g cached vs uncached).

The only problem could me getting the generic mmap() code to
properly pass the flag down into the driver, I seem to recall
that it either does an -EINVAL or masks out any flags which
are not in the standard set.

But then again this conflicts with what I remember seeing in the
XFree86 PCI support, in that IA64 passed in such a mmap() flag
to indicate a framebuffer like mapping that didn't need a guard-like
bit to be set.

Someone should look at the code to make sure :-)

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