vmsplice returned "bad address"
flat view
From: Valdis.Kletnieks at vt.edu <hidden>
Date: 2016-08-18 17:32:10
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