From 61ef2489dbf587258526cfd4ebf4bba3b079f401 Mon Sep 17 00:00:00 2001
From: Wu Fengguang
Date: Fri, 22 Jan 2010 16:16:19 +0800
Subject: 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.

v4: prefer plain 1 instead of PAGE_IS_RAM (H. Peter Anvin)
v3: add comment (KAMEZAWA Hiroyuki)
    "AFAIK, this "System RAM" information has been used for kdump to
    grab valid memory area and seems good for the kernel itself."
v2: add PAGE_IS_RAM macro (Américo Wang)

Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Yinghai Lu <yinghai@kernel.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
LKML-Reference: <20100122081619.GA6431@localhost>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 kernel/resource.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'kernel')

diff --git a/kernel/resource.c b/kernel/resource.c
index fb11a58b9594..b4d637a55256 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -297,6 +297,19 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 
 #endif
 
+static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+	return 1;
+}
+/*
+ * This generic page_is_ram() returns true if specified address is
+ * registered as "System RAM" in iomem_resource list.
+ */
+int __attribute__((weak)) page_is_ram(unsigned long pfn)
+{
+	return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
+}
+
 /*
  * Find empty slot in the resource tree given range and alignment.
  */
-- 
cgit v1.2.3


From e52730071567ec5b6f57e21d6693b112e01e1d0e Mon Sep 17 00:00:00 2001
From: Andrew Morton
Date: Tue, 26 Jan 2010 16:31:19 -0800
Subject: Generic page_is_ram: use __weak

Use __weak instead of __attribute__((weak)).

Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 kernel/resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel')

diff --git a/kernel/resource.c b/kernel/resource.c
index b4d637a55256..e68cd7477c40 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -305,7 +305,7 @@ static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
  * This generic page_is_ram() returns true if specified address is
  * registered as "System RAM" in iomem_resource list.
  */
-int __attribute__((weak)) page_is_ram(unsigned long pfn)
+int __weak page_is_ram(unsigned long pfn)
 {
 	return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
 }
-- 
cgit v1.2.3