On Wed, Jan 13, 2010 at 10:29:23PM +0800, Américo Wang wrote:
> On Wed, Jan 13, 2010 at 09:53:09PM +0800, Wu Fengguang wrote:
> >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@xxxxxxxxxxxxx>
> >CC: Lennox Wu <lennox.wu@xxxxxxxxx>
> >CC: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
> >CC: linux-mips@xxxxxxxxxxxxxx
> >CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> >Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> >---
> > 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);
> >+}
>
>
> Why do you choose 24 instead of using a macro expressing its meaning?
Hmm, I thought they are close enough to be obvious.
Anyway this should look better:
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@xxxxxxxxxxxxx>
CC: Lennox Wu <lennox.wu@xxxxxxxxx>
CC: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
CC: Américo Wang <xiyou.wangcong@xxxxxxxxx>
CC: linux-mips@xxxxxxxxxxxxxx
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
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 2010-01-13 21:27:28.000000000 +0800
+++ linux-mm/kernel/resource.c 2010-01-14 11:28:20.000000000 +0800
@@ -297,6 +297,17 @@ 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 2010-01-13 21:27:28.000000000 +0800
+++ linux-mm/include/linux/ioport.h 2010-01-13 21:44:50.000000000 +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 2010-01-13 21:27:28.000000000 +0800
+++ linux-mm/arch/score/mm/init.c 2010-01-13 21:44:50.000000000 +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 2010-01-13 21:27:28.000000000 +0800
+++ linux-mm/arch/mips/mm/init.c 2010-01-13 21:44:50.000000000 +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;
