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SubjectRe: linux-next: build warning after merge of the akpm-current tree
Hi Baoquan,

On Fri, 13 Mar 2020 20:56:27 +0800 Baoquan He <bhe@redhat.com> wrote:
>
> I made below change, but I can't triger these warnings. Could you try
> below patch, see if it's works?

I needed to add "ARCH=x86_64" to the "make allnoconfig" command line
(and the subsequent "make") otherwise I get a 32 bit build.

> From 9be668f1e30b6bb4ed5f4a07e7d3bb76d3f58f35 Mon Sep 17 00:00:00 2001
> From: Baoquan He <bhe@redhat.com>
> Date: Fri, 13 Mar 2020 20:25:54 +0800
> Subject: [PATCH] mm/sparse.c: fix the building warning with !SPARSEMEM
>
> Stephen reported below warnings are seen with allnoconfig on x86_64.
> Fix it by making those dummy functions sub-section map handling visible
> with CONFIG_SPARSEMEM enabled.
>
> 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)
> | ^~~~~~~~~~~~~~~~~~~~
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
> mm/sparse.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 362018e82e22..9e08d118719f 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -293,7 +293,7 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
>
> return rc;
> }
> -#else
> +#elif defined(CONFIG_SPARSEMEM)
> void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
> {
> }

This didn't make any difference as CONFIG_SPARSEMEM is set for the
x86_64 allnoconfig build.

--
Cheers,
Stephen Rothwell
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