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

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Date:	Fri, 07 Feb 2014 08:18:30 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Rashika Kheria <rashika.kheria@...il.com>,
	linux-kernel@...r.kernel.org
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	josh@...htriplett.org
Subject: Re: [PATCH 9/9] mm: Remove ifdef condition in include/linux/mm.h

On 02/07/2014 07:15 AM, Rashika Kheria wrote:
> The ifdef conditions in include/linux/mm.h presents three cases:
> 
> - !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
> There is no actual definition of function but include/linux/mm.h has a
> static inline stub defined.
> 
> - defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
> linux/mm.h does not define a prototype, but mm/page_alloc.c defines
> the function.
> Hence, compiler reports the following warning:
> mm/page_alloc.c:4300:15: warning: no previous prototype for ‘__early_pfn_to_nid’ [-Wmissing-prototypes]
> 
> - defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
> The architecture defines the function, and linux/mm.h has a prototype.
> 
> Thus, join the conditions of Case 2 and 3 i.e. eliminate the ifdef
> condition of CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID to eliminate the
> missing prototype warning from file mm/page_alloc.c.
> 
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>
> Reviewed-by: Josh Triplett <josh@...htriplett.org>

Reviewed-by: Rik van Riel <riel@...hat.com>

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