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

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Date:	Fri, 7 Feb 2014 17:45:42 +0530
From:	Rashika Kheria <rashika.kheria@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	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,
	josh@...htriplett.org
Subject: [PATCH 9/9] mm: Remove ifdef condition in include/linux/mm.h

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>
---
 include/linux/mm.h |    2 --
 1 file changed, 2 deletions(-)

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);
-- 
1.7.9.5

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