From: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
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.
[akpm@xxxxxxxx: coding cleanups]
Signed-off-by: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
Cc: "Brown, Len" <len.brown@xxxxxxxxx>
Cc: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/acpi/acpi_memhotplug.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff -puN drivers/acpi/acpi_memhotplug.c~catch-notification-of-memory-add-event-of-acpi-via-container-driveravoid-redundant-call-add_memory drivers/acpi/acpi_memhotplug.c
--- a/drivers/acpi/acpi_memhotplug.c~catch-notification-of-memory-add-event-of-acpi-via-container-driveravoid-redundant-call-add_memory
+++ a/drivers/acpi/acpi_memhotplug.c
@@ -234,6 +234,17 @@ 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;
_
-
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