Re: [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4

[Evgeny Baskakov]

On 7/20/17 6:33 PM, Jerome Glisse wrote:

> So i pushed an updated hmm-next branch it should have all fixes so far, including
> something that should fix this issue. I still want to go over all emails again
> to make sure i am not forgetting anything.
>
> Cheers,
> JÃrÃme

Hi Jerome,

Thanks for updating the documentation for hmm_devmem_ops.

I have an inquiry about the "fault" callback, though. The documentation 
says "Returns: 0 on success", but can the driver set any VM_FAULT_* 
flags? For instance, the driver might want to set the VM_FAULT_MAJOR 
flag to indicate that a heavy-weight page migration has happened on the 
page fault.

If that is possible, can you please update the documentation and list 
the flags that are permitted in the callback's return value?

Thanks!

--
Evgeny Baskakov
NVIDIA