Re: [RFC 2/3] mm: export zap_page_range()

[David Hildenbrand <david@redhat.com>]

On 18.03.22 10:55, Xiaoguang Wang wrote:
> Module target_core_user will use it to implement zero copy feature.
> 
> Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
> ---
>  mm/memory.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 1f745e4d11c2..9974d0406dad 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -1664,6 +1664,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
>  	mmu_notifier_invalidate_range_end(&range);
>  	tlb_finish_mmu(&tlb);
>  }
> +EXPORT_SYMBOL_GPL(zap_page_range);
>  
>  /**
>   * zap_page_range_single - remove user pages in a given range

To which VMAs will you be applying zap_page_range? I assume only to some
special ones where you previously vm_insert_page(s)_mkspecial'ed pages,
not to some otherwise random VMAs, correct?

-- 
Thanks,

David / dhildenb