[PATCH: 015/017]Memory hotplug for new nodes v.4.(avoid calling add_memory() for already exist memory)

[Yasunori Goto]

When acpi_memory_device_init() is called at boottime to
register struct memory acpi_memory_device, 
acpi_bus_add() are called via acpi_driver_attach().

But it also calls ops->start() function.
It is called even if the memory blocks are initialized at
early boottime. In this case add_memory() return -EEXIST, and
the memory blocks becomes INVALID state even if it is normal.

This is patch to avoid calling add_memory() for already available memory.

Signed-off-by: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>

 drivers/acpi/acpi_memhotplug.c |   10 ++++++++++
 1 files changed, 10 insertions(+)

Index: pgdat8/drivers/acpi/acpi_memhotplug.c
===================================================================
--- pgdat8.orig/drivers/acpi/acpi_memhotplug.c	2006-03-16 16:06:27.000000000 +0900
+++ pgdat8/drivers/acpi/acpi_memhotplug.c	2006-03-16 16:41:36.000000000 +0900
@@ -234,6 +234,16 @@ static int acpi_memory_enable_device(str
          * (i.e. memory-hot-remove function)
 	 */
 	list_for_each_entry(info, &mem_device->res_list, list) {
+		u64 start_pfn, end_pfn;
+		start_pfn= info->start_addr >> PAGE_SHIFT;
+		end_pfn = (info->start_addr + info->length - 1) >> PAGE_SHIFT;
+
+		if (pfn_valid(start_pfn) || pfn_valid(end_pfn)){
+			/* already enabled. try next area */
+			num_enabled++;
+			continue;
+		}
+
 		result = add_memory(info->start_addr, info->length);
 		if (result)
 			continue;

-- 
Yasunori Goto 


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