Re: [PATCH] mm: replace is_zero_pfn with is_huge_zero_pmd for thp

[Matthew Wilcox]

Why did you not cc Gerald who wrote the patch?  You can't just
run get_maintainers.pl and call it good.

On Sun, Aug 25, 2019 at 02:06:21PM -0600, Yu Zhao wrote:
> For hugely mapped thp, we use is_huge_zero_pmd() to check if it's
> zero page or not.
> 
> We do fill ptes with my_zero_pfn() when we split zero thp pmd, but
>  this is not what we have in vm_normal_page_pmd().
> pmd_trans_huge_lock() makes sure of it.
> 
> This is a trivial fix for /proc/pid/numa_maps, and AFAIK nobody
> complains about it.
> 
> Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
> ---
>  mm/memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index e2bb51b6242e..ea3c74855b23 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -654,7 +654,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>  
>  	if (pmd_devmap(pmd))
>  		return NULL;
> -	if (is_zero_pfn(pfn))
> +	if (is_huge_zero_pmd(pmd))
>  		return NULL;
>  	if (unlikely(pfn > highest_memmap_pfn))
>  		return NULL;
> -- 
> 2.23.0.187.g17f5b7556c-goog
>