Direct io failed with ion

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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?

-- 
Cheers,
Rock
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