linux-kernel - Re: [PATCH 4/8] resources: introduce generic page_is

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Date:	Wed, 13 Jan 2010 22:29:23 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chen Liqin <liqin.chen@...plusct.com>,
	Lennox Wu <lennox.wu@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <npiggin@...e.de>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 4/8] resources: introduce generic page_is_ram()

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@...plusct.com>
>CC: Lennox Wu <lennox.wu@...il.com>
>CC: Ralf Baechle <ralf@...ux-mips.org>
>CC: linux-mips@...ux-mips.org
>CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> 
>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      |   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?


>+
> /*
>  * 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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