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