Hi Konrad,

After merging the xen-two tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/xen/xen-acpi-memhotplug.c: In function 'acpi_memory_get_device':
drivers/xen/xen-acpi-memhotplug.c:191:2: error: implicit declaration of function 'acpi_bus_add' [-Werror=implicit-function-declaration]
drivers/xen/xen-acpi-memhotplug.c: At top level:
drivers/xen/xen-acpi-memhotplug.c:417:3: warning: initialization from incompatible pointer type [enabled by default]
drivers/xen/xen-acpi-memhotplug.c:417:3: warning: (near initialization for 'xen_acpi_memory_device_driver.ops.remove') [enabled by default]

Caused by commit 259f201cb7ea ("xen/acpi: ACPI memory hotplug").

drivers/xen/xen-acpi-cpuhotplug.c: In function 'acpi_processor_device_add':
drivers/xen/xen-acpi-cpuhotplug.c:254:2: error: implicit declaration of function 'acpi_bus_add' [-Werror=implicit-function-declaration]
drivers/xen/xen-acpi-cpuhotplug.c: At top level:
drivers/xen/xen-acpi-cpuhotplug.c:425:3: warning: initialization from incompatible pointer type [enabled by default]
drivers/xen/xen-acpi-cpuhotplug.c:425:3: warning: (near initialization for 'xen_acpi_processor_driver.ops.remove') [enabled by default]

Caused by commit 181232c249f0 ("xen/acpi: ACPI cpu hotplug").

These commits interacted with commits 636458de36f1 ("ACPI: Remove the
arguments of acpi_bus_add() that are not used"), 0cd6ac52b333 ("ACPI:
Make acpi_bus_scan() and acpi_bus_add() take only one argument") and
b8bd759acd05 ("ACPI / scan: Drop acpi_bus_add() and use acpi_bus_scan()
instead") from the pm tree.

I have added this merge fix patch and can carry it as necessary (I did
*not* fix the warnings above):

From: Stephen Rothwell <redacted>
Date: Fri, 15 Feb 2013 15:37:27 +1100
Subject: [PATCH] xen/acpi: fix up for apci_bus_add api change

Signed-off-by: Stephen Rothwell <redacted>
---
 drivers/xen/xen-acpi-cpuhotplug.c | 2 +-
 drivers/xen/xen-acpi-memhotplug.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
index 9eefbb0..0db4722 100644
--- a/drivers/xen/xen-acpi-cpuhotplug.c
+++ b/drivers/xen/xen-acpi-cpuhotplug.c

@@ -251,7 +251,7 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 	if (acpi_bus_get_device(phandle, &pdev))
 		return -ENODEV;
 
-	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR))
+	if (acpi_bus_scan(handle))
 		return -ENODEV;
 
 	return 0;

diff --git a/drivers/xen/xen-acpi-memhotplug.c b/drivers/xen/xen-acpi-memhotplug.c
index 678680c..164287b 100644
--- a/drivers/xen/xen-acpi-memhotplug.c
+++ b/drivers/xen/xen-acpi-memhotplug.c

@@ -188,7 +188,7 @@ acpi_memory_get_device(acpi_handle handle,
 	 * Now add the notified device.  This creates the acpi_device
 	 * and invokes .add function
 	 */
-	result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+	result = acpi_bus_scan(handle);
 	if (result) {
 		pr_warn(PREFIX "Cannot add acpi bus\n");
 		return -EINVAL;

-- 
1.8.1

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au