Hi Andrew,

On Thu, 7 May 2020 19:08:08 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> 
> This?  It's based on Ira's v3 series but should work.
> 
> 
> From: Andrew Morton <akpm@linux-foundation.org>
> Subject: arch-kunmap-remove-duplicate-kunmap-implementations-fix
> 
> fix CONFIG_HIGHMEM=n build on various architectures
> 
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Cc: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  include/linux/highmem.h |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- a/include/linux/highmem.h~arch-kunmap-remove-duplicate-kunmap-implementations-fix
> +++ a/include/linux/highmem.h
> @@ -53,6 +53,7 @@ static inline void *kmap(struct page *pa
>  }
>  
>  void kunmap_high(struct page *page);
> +
>  static inline void kunmap(struct page *page)
>  {
>  	might_sleep();
> @@ -111,6 +112,10 @@ static inline void *kmap(struct page *pa
>  	return page_address(page);
>  }
>  
> +static inline void kunmap_high(struct page *page)
> +{
> +}
> +
>  static inline void kunmap(struct page *page)
>  {
>  }
> _
> 

Thanks, I have added that to linux-next today.

-- 
Cheers,
Stephen Rothwell