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[PATCH 4/8] resources: introduce generic page_is_ram()

To: Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH 4/8] resources: introduce generic page_is_ram()
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Wed, 13 Jan 2010 21:53:09 +0800
Cc: Wu Fengguang <fengguang.wu@intel.com>, LKML <linux-kernel@vger.kernel.org>, Chen Liqin <liqin.chen@sunplusct.com>, Lennox Wu <lennox.wu@gmail.com>, Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Linux Memory Management List <linux-mm@kvack.org>
References: <20100113135305.013124116@intel.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: quilt/0.48-1
It's based on walk_system_ram_range(), for archs that don't have
their own page_is_ram().

The static verions in MIPS and SCORE are also made global.

CC: Chen Liqin <liqin.chen@sunplusct.com>
CC: Lennox Wu <lennox.wu@gmail.com>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: linux-mips@linux-mips.org
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 arch/mips/mm/init.c    |    2 +-
 arch/score/mm/init.c   |    2 +-
 include/linux/ioport.h |    2 ++
 kernel/resource.c      |   10 ++++++++++
 4 files changed, 14 insertions(+), 2 deletions(-)

--- linux-mm.orig/kernel/resource.c     2010-01-10 10:11:53.000000000 +0800
+++ linux-mm/kernel/resource.c  2010-01-10 10:15:33.000000000 +0800
@@ -297,6 +297,16 @@ int walk_system_ram_range(unsigned long 
 
 #endif
 
+static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+       return 24;
+}
+
+int __attribute__((weak)) page_is_ram(unsigned long pfn)
+{
+       return 24 == walk_system_ram_range(pfn, 1, NULL, __is_ram);
+}
+
 /*
  * Find empty slot in the resource tree given range and alignment.
  */
--- linux-mm.orig/include/linux/ioport.h        2010-01-10 10:11:53.000000000 
+0800
+++ linux-mm/include/linux/ioport.h     2010-01-10 10:11:54.000000000 +0800
@@ -188,5 +188,7 @@ extern int
 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
                void *arg, int (*func)(unsigned long, unsigned long, void *));
 
+extern int page_is_ram(unsigned long pfn);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _LINUX_IOPORT_H */
--- linux-mm.orig/arch/score/mm/init.c  2010-01-10 10:35:38.000000000 +0800
+++ linux-mm/arch/score/mm/init.c       2010-01-10 10:38:04.000000000 +0800
@@ -59,7 +59,7 @@ static unsigned long setup_zero_page(voi
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-static int __init page_is_ram(unsigned long pagenr)
+int page_is_ram(unsigned long pagenr)
 {
        if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
                return 1;
--- linux-mm.orig/arch/mips/mm/init.c   2010-01-10 10:37:22.000000000 +0800
+++ linux-mm/arch/mips/mm/init.c        2010-01-10 10:37:26.000000000 +0800
@@ -298,7 +298,7 @@ void __init fixrange_init(unsigned long 
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-static int __init page_is_ram(unsigned long pagenr)
+int page_is_ram(unsigned long pagenr)
 {
        int i;
 



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