On Thu, Oct 11, 2018 at 11:24:49AM +0800, Rock Lee wrote:
> Hi
>     I tested direct io with a ion allocated buffer, got a -EFAULT
> error. It turned out that ion_mmap() set VM_IO & VM_PFNMAP, but
> check_vma_flags() (do_direct_IO() calls it) doesn't allow that VMA has
> these flags set. Could you give me any hit that could solve this
> issue?
> 

You must be using an old kernel because ion_mmap() was changed in April.

regards,
dan carpenter

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