linux-kernel - Re: [PATCH] mm: fix prototype warning from kernel test robot

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Message-ID: <20210122084659.GA29905@MiWiFi-R3L-srv>
Date:   Fri, 22 Jan 2021 16:46:59 +0800
From:   Baoquan He <bhe@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, rppt@...nel.org
Subject: Re: [PATCH] mm: fix prototype warning from kernel test robot

On 01/22/21 at 09:40am, David Hildenbrand wrote:
> 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@...hat.com>
> > Reported-by: kernel test robot <lkp@...el.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.

Right, this one is based on the memmap_init_xx clean up patchset. I
mentioned this the the sub-thread of kernel test robot reporting issues.