[PATCH hmm 4/8] mm/hmm: add missing pfns set to hmm_vma_walk_pmd()

[Christoph Hellwig]

On Wed, Mar 11, 2020 at 03:35:02PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg at mellanox.com>
> 
> All success exit paths from the walker functions must set the pfns array.
> 
> A migration entry with no required fault is a HMM_PFN_NONE return, just
> like the pte case.
> 
> Fixes: d08faca018c4 ("mm/hmm: properly handle migration pmd")
> Signed-off-by: Jason Gunthorpe <jgg at mellanox.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch at lst.de>