linux-kernel - Re: [PATCH] Cast page_to_pfn to unsigned long in CONFIG

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Date:	Mon, 19 Nov 2007 15:20:23 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, mbligh@...gle.com
Subject: Re: [PATCH] Cast page_to_pfn to unsigned long in CONFIG_SPARSEMEM

* Dave Hansen (haveblue@...ibm.com) wrote:
> The only thing I might suggest doing differently is actually using the
> page_to_pfn() definition itself:
> 
> memory_model.h:#define page_to_pfn __page_to_pfn
> 
> The full inline function version should do this already, and we
> shouldn't have any real direct __page_to_pfn() users anyway.    
> 

Like this then..

Cast page_to_pfn to unsigned long in CONFIG_SPARSEMEM

Make sure the type returned by page_to_pfn is always unsigned long. If we
don't cast it explicitly, it can be int on i386, but long on x86_64. This is
especially inelegant for printks.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Dave Hansen <haveblue@...ibm.com>
CC: linux-mm@...ck.org
CC: linux-kernel@...r.kernel.org
---
 include/asm-generic/memory_model.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-generic/memory_model.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-generic/memory_model.h	2007-11-19 15:06:40.000000000 -0500
+++ linux-2.6-lttng/include/asm-generic/memory_model.h	2007-11-19 15:18:57.000000000 -0500
@@ -76,7 +76,7 @@ struct page;
 extern struct page *pfn_to_page(unsigned long pfn);
 extern unsigned long page_to_pfn(struct page *page);
 #else
-#define page_to_pfn __page_to_pfn
+#define page_to_pfn ((unsigned long)__page_to_pfn)
 #define pfn_to_page __pfn_to_page
 #endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
 



-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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