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

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Message-ID: <20200313105526.GM27711@MiWiFi-R3L-srv>
Date:   Fri, 13 Mar 2020 18:55:26 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the akpm-current tree

On 03/13/20 at 09:42pm, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (x86_64
> allnoconfig) produced this warning:

I tried with allnoconfig on x86_64, make doesn't trigger below warnings.

Hi Andrew,

Should we fix this kind of warning? If have to, I'll try to make several 
macro functions like subsection_map_init does for !CONFIG_SPARSEMEM.

> 
> mm/sparse.c:311:12: warning: 'fill_subsection_map' defined but not used [-Wunused-function]
>   311 | static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
>       |            ^~~~~~~~~~~~~~~~~~~
> mm/sparse.c:306:13: warning: 'is_subsection_map_empty' defined but not used [-Wunused-function]
>   306 | static bool is_subsection_map_empty(struct mem_section *ms)
>       |             ^~~~~~~~~~~~~~~~~~~~~~~
> mm/sparse.c:301:12: warning: 'clear_subsection_map' defined but not used [-Wunused-function]
>   301 | static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
>       |            ^~~~~~~~~~~~~~~~~~~~
> 
> Introduced by commits
> 
>   38eb09ac7c29 ("mm/sparse.c: introduce new function fill_subsection_map()")
>   334411156ba6 ("mm/sparse.c: introduce a new function clear_subsection_map()")
> 
> Or maybe laster patches.
> 
> -- 
> Cheers,
> Stephen Rothwell