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[PATCH 1/3] resources: introduce generic page_is_ram()

To: Thomas Gleixner <tglx@linutronix.de>
To: Ingo Molnar <mingo@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH 1/3] resources: introduce generic page_is_ram()
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Fri, 22 Jan 2010 11:21:03 +0800
Cc: Andrew Morton <akpm@linux-foundation.org>, Chen Liqin <liqin.chen@sunplusct.com>, Lennox Wu <lennox.wu@gmail.com>, Ralf Baechle <ralf@linux-mips.org>, Américo Wang <xiyou.wangcong@gmail.com>, linux-mips@linux-mips.org, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Yinghai Lu <yinghai@kernel.org>, Wu Fengguang <fengguang.wu@intel.com>
Cc: x86@kernel.org
Cc: LKML <linux-kernel@vger.kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>, shaohui.zheng@intel.com
References: <20100122032102.137106635@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: Américo Wang <xiyou.wangcong@gmail.com>
CC: linux-mips@linux-mips.org
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 
CC: Yinghai Lu <yinghai@kernel.org>
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      |   11 +++++++++++
 4 files changed, 15 insertions(+), 2 deletions(-)

--- linux-mm.orig/kernel/resource.c     2010-01-22 11:20:34.000000000 +0800
+++ linux-mm/kernel/resource.c  2010-01-22 11:20:35.000000000 +0800
@@ -327,6 +327,17 @@ int walk_system_ram_range(unsigned long 
 
 #endif
 
+#define PAGE_IS_RAM    24
+static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+       return PAGE_IS_RAM;
+}
+int __attribute__((weak)) page_is_ram(unsigned long pfn)
+{
+       return PAGE_IS_RAM == walk_system_ram_range(pfn, 1, NULL, __is_ram);
+}
+#undef PAGE_IS_RAM
+
 /*
  * Find empty slot in the resource tree given range and alignment.
  */
--- linux-mm.orig/include/linux/ioport.h        2010-01-22 11:20:34.000000000 
+0800
+++ linux-mm/include/linux/ioport.h     2010-01-22 11:20:35.000000000 +0800
@@ -191,5 +191,7 @@ 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  2010-01-22 11:20:34.000000000 +0800
+++ linux-mm/arch/score/mm/init.c       2010-01-22 11:20:35.000000000 +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   2010-01-22 11:20:34.000000000 +0800
+++ linux-mm/arch/mips/mm/init.c        2010-01-22 11:20:35.000000000 +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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