vmsplice returned "bad address"

Teoh Choon Zone choon-zone.teoh at vie.com.my
Thu Aug 18 21:28:22 EDT 2016


On Fri, Aug 19, 2016 at 1:32 AM, <Valdis.Kletnieks at vt.edu> wrote:

>
> Step 1: Figure out whether your driver is returning a physical or logical
> address for the CMA, and which of the two /dev/mem requires.
>
> Step 2: Take a look at the address returned and make sure it at least
> looks valid (is someplace the E820 map says is RAM, isn't a PCI BAR or
> something like that, etc etc)
>
> Those are the two biggest sources of error I can think of...
>

First of all, just want to make my problem clear, the "bad address" is
returned when I call vmsplice(), not mmap().

1. I have verified the address is a physical one
2. It indeed is within the RAM range

What bugs me is that write() works just fine but vmsplice() complains about
the address.
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