Re: [PATCH] mm: introduce kvvirt_to_page() helper

[Michal Hocko]

On Thu 16-08-18 17:17:37, Li RongQing wrote:
> The new helper returns address mapping page, which has several users
> in individual subsystem, like mem_to_page in xfs_buf.c and pgv_to_page
> in af_packet.c, after this, they can be unified

Please add users along with the new helper.

> 
> Signed-off-by: Zhang Yu <zhangyu31@xxxxxxxxx>
> Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
> ---
>  include/linux/mm.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 68a5121694ef..bb34a3c71df5 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -599,6 +599,14 @@ static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
>  	return kvmalloc_array(n, size, flags | __GFP_ZERO);
>  }
>  
> +static inline struct page *kvvirt_to_page(const void *addr)
> +{
> +	if (!is_vmalloc_addr(addr))
> +		return virt_to_page(addr);
> +	else
> +		return vmalloc_to_page(addr);
> +}
> +
>  extern void kvfree(const void *addr);
>  
>  static inline atomic_t *compound_mapcount_ptr(struct page *page)
> -- 
> 2.16.2
> 

-- 
Michal Hocko
SUSE Labs