[PATCH 10/13] mm: only define hmm_vma_walk_pud if needed

[Jason Gunthorpe]

On Tue, Jul 30, 2019 at 08:52:00AM +0300, Christoph Hellwig wrote:
> We only need the special pud_entry walker if PUD-sized hugepages and
> pte mappings are supported, else the common pagewalk code will take
> care of the iteration.  Not implementing this callback reduced the
> amount of code compiled for non-x86 platforms, and also fixes compile
> failures with other architectures when helpers like pud_pfn are not
> implemented.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  mm/hmm.c | 29 ++++++++++++++++-------------
>  1 file changed, 16 insertions(+), 13 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at mellanox.com>

Jason