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 fails. 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(). We may hotremove the memory device by this 2 ways at the same time. So we remove the function acpi_memory_disable_device(), and use acpi_bus_hot_remove_device() which is used by 2nd case to implement it. We lock device in acpi_bus_hot_remove_device(), so there is no need to add lock in acpi_memhotplug. The last version of this patchset is here: https://lkml.org/lkml/2012/11/8/121 Note: 1. The following commit in pm tree can be dropped now(The other two patches are already dropped): 54c4c7db6cb94d7d1217df6d7fca6847c61744ab 2. This patchset requires the following patch(It is in pm tree now) https://lkml.org/lkml/2012/11/1/225 Changes from v4 to v5: 1. patch2: new patch. use acpi_bus_hot_remove_device() to implement memory device hotremove. Changes from v3 to v4: 1. patch1: unlock list_lock when removing memory fails. 2. patch2: just rebase them 3. patch3-7: these patches are in -mm tree, and they conflict with this patchset, so Adrew Morton drop them from -mm tree. I rebase and merge them into this patchset. Wen Congyang (6): acpi,memory-hotplug: deal with eject request in hotplug queue acpi_memhotplug.c: fix memory leak when memory device is unbound from the module acpi_memhotplug acpi_memhotplug.c: free memory device if acpi_memory_enable_device() failed acpi_memhotplug.c: don't allow to eject the memory device if it is being used acpi_memhotplug.c: bind the memory device when the driver is being loaded acpi_memhotplug.c: auto bind the memory device which is hotplugged before the driver is loaded Yasuaki Ishimatsu (1): acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove() drivers/acpi/acpi_memhotplug.c | 206 ++++++++++++++++++++++------------------- 1 file changed, 109 insertions(+), 97 deletions(-) -- 1.8.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>