On Thu, Jan 21, 2010 at 10:15:50PM -0700, Xiaotian Feng wrote:
> On Fri, Jan 22, 2010 at 11:21 AM, Wu Fengguang <fengguang.wu@xxxxxxxxx> 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: Américo Wang <xiyou.wangcong@xxxxxxxxx>
> > CC: linux-mips@xxxxxxxxxxxxxx
> > CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> > CC: Yinghai Lu <yinghai@xxxxxxxxxx>
> > 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 2010-01-22 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
> > +
>
> I'm not sure, but any build test for powerpc/mips/score?
Sorry, no build tests yet:
/bin/sh: score-linux-gcc: command not found
I just make the mips/score page_is_ram() non-static and assume that
will make it compile.
> walk_system_ram_range is defined when CONFIG_ARCH_HAS_WALK_MEMORY is not set.
> Is it safe when CONFIG_ARCH_HAS_WALK_MEMORY is set for some powerpc archs?
Good question. Grep shows that CONFIG_ARCH_HAS_WALK_MEMORY is only
defined for powerpc, and it has its own page_is_ram() as well as
walk_system_ram_range().
walk_system_ram_range() must be defined somewhere because it is
expected to be generic routine: exported and called from both
in-kernel and out-of-tree code.
Thanks,
Fengguang
