Re: Direct io failed with ion

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On Thu, Oct 11, 2018 at 4:12 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>
> 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.

Yes, I am using linux-4.4 which is a little old. Even in linux-4.18,
ion_mmap() still callls remap_pfn_range() if the heap is
carvout/system/cma/chunk. But remap_pfn_range() set VM_IO & IO_PFNMAP
as well.

-- 
Cheers,
Rock
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