[PATCH](acpi:memory hotplug) Remove strange add_memory fail message

[Yasunori Goto <y-goto@jp.fujitsu.com>]

Hello.

I wrote a patch to avoid redundant memory hot-add call at boot time.
This was cause of strange fail message of memory hotplug
like "ACPI: add_memory failed".
Memory is recognized by early boot code with EFI/E820.
But, if DSDT describes memory devices for them, then hot-add
code is called for already recognized memory, and it shows fail messages
with -EEXIST.
So, sys admin will misunderstand this message as something wrong by
it.

This patch avoids them by preventing redundant hot-add call until
completion of driver initialization. 

This patch is for 2.6.19-rc2.
I tested this patch on Tiger4 with my hot-add emulation.

Please apply.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

---
 drivers/acpi/acpi_memhotplug.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

---

Index: linux-2.6.18/drivers/acpi/acpi_memhotplug.c
===================================================================
--- linux-2.6.18.orig/drivers/acpi/acpi_memhotplug.c	2006-10-18 21:12:33.000000000 +0900
+++ linux-2.6.18/drivers/acpi/acpi_memhotplug.c	2006-10-18 22:50:44.000000000 +0900
@@ -85,6 +85,8 @@
 	struct list_head res_list;
 };
 
+int acpi_hotmem_initialized = 0;
+
 static acpi_status
 acpi_memory_get_resource(struct acpi_resource *resource, void *context)
 {
@@ -438,6 +440,15 @@
 	struct acpi_memory_device *mem_device;
 	int result = 0;
 
+	/*
+	 * Early boot code has recognized memory area by EFI/E820.
+	 * If DSDT shows these memory devices on boot, hotplug is not necessary
+	 * for them. So, it just returns until completion of this driver's
+	 * start up.
+	 */
+	if (!acpi_hotmem_initialized)
+		return 0;
+
 	mem_device = acpi_driver_data(device);
 
 	if (!acpi_memory_check_device(mem_device)) {
@@ -537,6 +548,7 @@
 		return -ENODEV;
 	}
 
+	acpi_hotmem_initialized = 1;
 	return 0;
 }
 


-- 
Yasunori Goto