Re: [PATCH 01/12] mm/gup.c: Remove redundant check for PCI P2PDMA page

[Dan Williams]

Alistair Popple wrote:
> PCI P2PDMA pages are not mapped with pXX_devmap PTEs therefore the
> check in __gup_device_huge() is redundant. Remove it
> 
> Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Acked-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
>  mm/gup.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index d19884e..5d2fc9a 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -2954,11 +2954,6 @@ static int gup_fast_devmap_leaf(unsigned long pfn, unsigned long addr,
>  			break;
>  		}
>  
> -		if (!(flags & FOLL_PCI_P2PDMA) && is_pci_p2pdma_page(page)) {
> -			gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
> -			break;
> -		}
> -

Looks good.

Reviewed-by: Dan Wiliams <dan.j.williams@xxxxxxxxx>