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Subject: Re: [PATCH] mm: fix prototype warning from kernel test robot
To:     Baoquan He <bhe@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org, rppt@kernel.org
References: <20210122070359.24010-1-bhe@redhat.com>
From:   David Hildenbrand <david@redhat.com>
Organization: Red Hat GmbH
Message-ID: <3fd62f11-bf44-3ede-aed1-10d9d4849f00@redhat.com>
Date:   Fri, 22 Jan 2021 09:40:44 +0100
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On 22.01.21 08:03, Baoquan He wrote:
> Kernel test robot calling make with 'W=1' triggering warning like below
> below for memmap_init_zone() function.
> 
> mm/page_alloc.c:6259:23: warning: no previous prototype for 'memmap_init_zone' [-Wmissing-prototypes]
>  6259 | void __meminit __weak memmap_init_zone(unsigned long size, int nid,
>       |                       ^~~~~~~~~~~~~~~~
> 
> Fix it by adding the function declaration in include/linux/mm.h.
> Since memmap_init_zone() has a generic version with '__weak',
> the declaratoin in ia64 header file can be simply removed.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/ia64/include/asm/pgtable.h | 5 -----
>  include/linux/mm.h              | 1 +
>  2 files changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
> index 2c81394a2430..9b4efe89e62d 100644
> --- a/arch/ia64/include/asm/pgtable.h
> +++ b/arch/ia64/include/asm/pgtable.h
> @@ -517,11 +517,6 @@ extern struct page *zero_page_memmap_ptr;
>  	__changed;							\
>  })
>  #endif
> -
> -#  ifdef CONFIG_VIRTUAL_MEM_MAP
> -  /* arch mem_map init routine is needed due to holes in a virtual mem_map */
> -    extern void memmap_init_zone(struct zone *zone);
> -#  endif /* CONFIG_VIRTUAL_MEM_MAP */
>  # endif /* !__ASSEMBLY__ */
>  
>  /*
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 56bb239f9150..073049bd0b29 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2401,6 +2401,7 @@ extern void set_dma_reserve(unsigned long new_dma_reserve);
>  extern void memmap_init_range(unsigned long, int, unsigned long,
>  		unsigned long, unsigned long, enum meminit_context,
>  		struct vmem_altmap *, int migratetype);
> +extern void memmap_init_zone(struct zone *zone);
>  extern void setup_per_zone_wmarks(void);
>  extern int __meminit init_per_zone_wmark_min(void);
>  extern void mem_init(void);
> 

This patch is on top of your other series, no?

In -next, we have

extern void memmap_init_zone(unsigned long, int, unsigned long, ...

In that file, so something is wrong.

-- 
Thanks,

David / dhildenb