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Subject: Re: [PATCH] mm: fix -Wmissing-prototypes warnings
To:     Yi Wang <wang.yi59@zte.com.cn>, akpm@linux-foundation.org
Cc:     keescook@chromium.org, dan.j.williams@intel.com, cai@lca.pw,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        osalvador@suse.de, mhocko@suse.com, rppt@linux.ibm.com,
        richardw.yang@linux.intel.com, xue.zhihong@zte.com.cn,
        up2wing@gmail.com, wang.liang82@zte.com.cn
References: <1566978161-7293-1-git-send-email-wang.yi59@zte.com.cn>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <89532e1d-bc41-ce70-ae3c-d6073e5c3cd4@redhat.com>
Date:   Mon, 9 Sep 2019 09:52:40 +0200
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On 28.08.19 09:42, Yi Wang wrote:
> We get two warnings when build kernel W=1:
> mm/shuffle.c:36:12: warning: no previous prototype for ‘shuffle_show’
> [-Wmissing-prototypes]
> mm/sparse.c:220:6: warning: no previous prototype for
> ‘subsection_mask_set’ [-Wmissing-prototypes]
> 
> Make the function static to fix this.
> 
> Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
> ---
>  mm/shuffle.c | 2 +-
>  mm/sparse.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/shuffle.c b/mm/shuffle.c
> index 3ce1248..b3fe97f 100644
> --- a/mm/shuffle.c
> +++ b/mm/shuffle.c
> @@ -33,7 +33,7 @@ __meminit void page_alloc_shuffle(enum mm_shuffle_ctl ctl)
>  }
>  
>  static bool shuffle_param;
> -extern int shuffle_show(char *buffer, const struct kernel_param *kp)
> +static int shuffle_show(char *buffer, const struct kernel_param *kp)
>  {
>  	return sprintf(buffer, "%c\n", test_bit(SHUFFLE_ENABLE, &shuffle_state)
>  			? 'Y' : 'N');
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 72f010d..49006dd 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -217,7 +217,7 @@ static inline unsigned long first_present_section_nr(void)
>  	return next_present_section_nr(-1);
>  }
>  
> -void subsection_mask_set(unsigned long *map, unsigned long pfn,
> +static void subsection_mask_set(unsigned long *map, unsigned long pfn,
>  		unsigned long nr_pages)
>  {
>  	int idx = subsection_map_index(pfn);
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 

Thanks,

David / dhildenb