Subject: Re: linux-next: build warning after merge of the akpm-current tree

From: Miaohe Lin <[email-masked]>
Date: Fri, 21 May 2021 14:53:13 +0800

On 2021/5/21 13:39, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
> 
> mm/swapfile.c:1039:22: warning: 'scan_swap_map' defined but not used [-Wunused-function]
>  1039 | static unsigned long scan_swap_map(struct swap_info_struct *si,
>       |                      ^~~~~~~~~~~~~
> 
> Introduced by commit
> 
>   c9ea6b99df3c ("mm/swapfile: move get_swap_page_of_type() under CONFIG_HIBERNATION")
> 
> # CONFIG_HIBERNATION is not set

It seems that scan_swap_map is only used by get_swap_page_of_type(). I should have been more careful
and move it under CONFIG_HIBERNATION too. I will send a patch to fix this. Many thanks!