x86: Use the generic page_is_ram()

The generic resource based page_is_ram() works better with memory
hotplug/hotremove. So switch the x86 e820map based code to it.

CC: Andi Kleen <andi@firstfloor.org>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
LKML-Reference: <20100122033004.470767217@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h
index 642fe34..a667f24 100644 (file)
--- a/arch/x86/include/asm/page_types.h
+++ b/arch/x86/include/asm/page_types.h
@@ -40,7 +40,6 @@
 
 #ifndef __ASSEMBLY__
 
-extern int page_is_ram(unsigned long pagenr);
 extern int devmem_is_allowed(unsigned long pagenr);
 
 extern unsigned long max_low_pfn_mapped;

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 30e068d..1bf9e08 100644 (file)
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -24,27 +24,6 @@
 
 #include "physaddr.h"
 
-int page_is_ram(unsigned long pagenr)
-{
-       resource_size_t addr, end;
-       int i;
-
-       for (i = 0; i < e820.nr_map; i++) {
-               /*
-                * Not usable memory:
-                */
-               if (e820.map[i].type != E820_RAM)
-                       continue;
-               addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT;
-               end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT;
-
-
-               if ((pagenr >= addr) && (pagenr < end))
-                       return 1;
-       }
-       return 0;
-}
-
 /*
  * Fix up the linear direct mapping of the kernel to avoid cache attribute
  * conflicts.