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

Wu Fengguang
2010-01-22T03:30:40Z

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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;