linux-kernel - Re: [PATCH 1/3] resources: introduce generic page_is

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Date:	Fri, 22 Jan 2010 13:15:50 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chen Liqin <liqin.chen@...plusct.com>,
	Lennox Wu <lennox.wu@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Américo Wang <xiyou.wangcong@...il.com>,
	linux-mips@...ux-mips.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>, shaohui.zheng@...el.com
Subject: Re: [PATCH 1/3] resources: introduce generic page_is_ram()

On Fri, Jan 22, 2010 at 11:21 AM, Wu Fengguang <fengguang.wu@...el.com> 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@...plusct.com>
> CC: Lennox Wu <lennox.wu@...il.com>
> CC: Ralf Baechle <ralf@...ux-mips.org>
> CC: Américo Wang <xiyou.wangcong@...il.com>
> CC: linux-mips@...ux-mips.org
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> CC: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.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
> +

I'm not sure, but any build test for powerpc/mips/score?
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?

>  /*
>  * 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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