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Subject[PATCH v3 0/3] acpi,memory-hotplug : implement framework for hot removing memory
From: Wen Congyang <>

The patch-set implements a framework for hot removing memory.

The memory device can be removed by 2 ways:
1. send eject request by SCI
2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject

In the 1st case, acpi_memory_disable_device() will be called.
In the 2nd case, acpi_memory_device_remove() will be called.
acpi_memory_device_remove() will also be called when we unbind the
memory device from the driver acpi_memhotplug or a driver initialization

acpi_memory_disable_device() has already implemented a code which
offlines memory and releases acpi_memory_info struct . But
acpi_memory_device_remove() has not implemented it yet.

So the patch prepares the framework for hot removing memory and
adds the framework into acpi_memory_device_remove().

The last version of this patchset is here:

Changelogs from v2 to v3:
Patch2: rename lock to list_lock

Changelogs from v1 to v2:
Patch1: use acpi_bus_trim() instead of acpi_bus_remove()
Patch2: new patch, introduce a lock to protect the list
Patch3: remove memory too when type is ACPI_BUS_REMOVAL_NORMAL
Note: I don't send [Patch2-4 v1] in this series because they
are no logical changes in these 3 patches.

Wen Congyang (2):
acpi,memory-hotplug: call acpi_bus_trim() to remove memory device
acpi,memory-hotplug: introduce a mutex lock to protect the list in

Yasuaki Ishimatsu (1):
acpi,memory-hotplug : add memory offline code to

drivers/acpi/acpi_memhotplug.c | 51 +++++++++++++++++++++++++++++++++---------
1 file changed, 41 insertions(+), 10 deletions(-)


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