vmsplice returned "bad address"

[Valdis.Kletnieks at vt.edu]

On Fri, 19 Aug 2016 00:19:47 +0800, Teoh Choon Zone said:

> I have a driver which will dma_alloc a CMA region and return the address to
> my user space program, the program then will mmap /dev/mem according to the
> address offset.

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...
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