linux-kernel - Re: [PATCH 9/9] mm: Remove ifdef condition in include/linux/mm.h

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Date:	Fri, 7 Feb 2014 13:07:05 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Rashika Kheria <rashika.kheria@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org
Subject: Re: [PATCH 9/9] mm: Remove ifdef condition in include/linux/mm.h

On Fri, Feb 07, 2014 at 01:04:47PM -0800, David Rientjes wrote:
> On Fri, 7 Feb 2014, Rashika Kheria wrote:
> 
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 1cedd00..5f8348f 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -1589,10 +1589,8 @@ static inline int __early_pfn_to_nid(unsigned long pfn)
> >  #else
> >  /* please see mm/page_alloc.c */
> >  extern int __meminit early_pfn_to_nid(unsigned long pfn);
> > -#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
> >  /* there is a per-arch backend function. */
> >  extern int __meminit __early_pfn_to_nid(unsigned long pfn);
> > -#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
> >  #endif
> >  
> >  extern void set_dma_reserve(unsigned long new_dma_reserve);
> 
> Wouldn't it be better to just declare the __early_pfn_to_nid() in 
> mm/page_alloc.c to be static?

Won't that break the ability to override that function in
architecture-specific code (as arch/ia64/mm/numa.c does)?

- Josh Triplett
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