vmsplice returned "bad address"

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Thu Aug 18 13:32:10 EDT 2016


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...
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 848 bytes
Desc: not available
Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160818/23e15bc5/attachment.bin 


More information about the Kernelnewbies mailing list