linux.git/drivers/acpi/acpi_memhotplug.c, branch v3.13

Merge branch 'acpi-hotplug'

2013-10-28T00:12:41+00:00

* acpi-hotplug:
  ACPI / memhotplug: Use defined marco METHOD_NAME__STA
  ACPI / hotplug: Use kobject_init_and_add() instead of _init() and _add()
  ACPI / hotplug: Don't set kobject parent pointer explicitly
  ACPI / hotplug: Set kobject name via kobject_add(), not kobject_set_name()
  hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()
  hotplug / x86: Disable ARCH_CPU_PROBE_RELEASE on x86
  hotplug / x86: Add hotplug lock to missing places
  hotplug / x86: Fix online state in cpu0 debug interface

ACPI / memhotplug: Use defined marco METHOD_NAME__STA

2013-10-10T00:32:33+00:00

We already have predefined marco for method name "_STA', so
using the marco instead of directly using the string.

Signed-off-by: Zhang Yanfei 
Signed-off-by: Rafael J. Wysocki

ACPI / mm: use NUMA_NO_NODE

2013-09-23T23:40:38+00:00

Use more appropriate NUMA_NO_NODE instead of -1

Signed-off-by: Jianguo Wu 
Acked-by: David Rientjes 
Signed-off-by: Rafael J. Wysocki

ACPI / memhotplug: Fix a stale pointer in error path

2013-07-14T23:26:18+00:00

device->driver_data needs to be cleared when releasing its data,
mem_device, in an error path of acpi_memory_device_add().

The function evaluates the _CRS of memory device objects, and fails
when it gets an unexpected resource or cannot allocate memory.  A
kernel crash or data corruption may occur when the kernel accesses
the stale pointer.

Signed-off-by: Toshi Kani 
Reviewed-by: Yasuaki Ishimatsu 
Cc: 2.6.32+ 
Signed-off-by: Rafael J. Wysocki

Memory hotplug / ACPI: Simplify memory removal

2013-06-01T19:37:10+00:00

Now that the memory offlining should be taken care of by the
companion device offlining code in acpi_scan_hot_remove(), the
ACPI memory hotplug driver doesn't need to offline it in
remove_memory() any more.  Moreover, since the return value of
remove_memory() is not used, it's better to make it be a void
function and trigger a BUG() if the memory scheduled for removal is
not offline.

Change the code in accordance with the above observations.

Signed-off-by: Rafael J. Wysocki 
Reviewed-by: Toshi Kani

ACPI / memhotplug: Bind removable memory blocks to ACPI device nodes

2013-05-12T12:14:38+00:00

During ACPI memory hotplug configuration bind memory blocks residing
in modules removable through the standard ACPI mechanism to struct
acpi_device objects associated with ACPI namespace objects
representing those modules.  Accordingly, unbind those memory blocks
from the struct acpi_device objects when the memory modules in
question are being removed.

When "offline" operation for devices representing memory blocks is
introduced, this will allow the ACPI core's device hot-remove code to
use it to carry out remove_memory() for those memory blocks and check
the results of that before it actually removes the modules holding
them from the system.

Since walk_memory_range() is used for accessing all memory blocks
corresponding to a given ACPI namespace object, it is exported from
memory_hotplug.c so that the code in acpi_memhotplug.c can use it.

Signed-off-by: Rafael J. Wysocki 
Tested-by: Vasilis Liaskovitis 
Reviewed-by: Toshi Kani

ACPI / memhotplug: Remove info->failed bit

2013-03-24T23:36:25+00:00

acpi_memory_info has enabled bit and failed bit for controlling memory
hotplug. But we don't need to keep both bits.

The patch removes acpi_memory_info->failed bit.

Signed-off-by: yasuaki ishimatsu 
Acked-by: Toshi Kani 
Signed-off-by: Rafael J. Wysocki

ACPI / memhotplug: set info->enabled for memory present at boot time

2013-03-24T23:34:36+00:00

At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread,
Toshi Kani mentioned as follows:

"I have a question about the change you made in commit 65479472 in
acpi_memhotplug.c.  This change seems to require that
acpi_memory_enable_device() calls add_memory() to add all memory ranges
represented by memory device objects at boot-time, and keep the results
be used for hot-remove.

If I understand it right, this add_memory() call fails with EEXIST at
boot-time since all memory ranges should have been added from EFI memory
table (or e820) already.  This results all memory ranges be marked as !
enabled & !failed.  I think this means that we cannot hot-delete any
memory ranges presented at boot-time since acpi_memory_remove_memory()
only calls remove_memory() when the enabled flag is set.  Is that
correct?"

Above mention is correct. Thus even if memory device supports hotplug,
memory presented at boot-time cannot be hot removed since the memory
device's acpi_memory_info->enabled is always 0.

This patch changes to set 1 to "acpi_memory_info->enabled" of memory
device presented at boot-time for hot removing the memory device.

Signed-off-by: Yasuaki Ishimatsu 
Acked-by: Toshi Kani 
Signed-off-by: Rafael J. Wysocki

ACPI / scan: Make memory hotplug driver use struct acpi_scan_handler

2013-03-04T13:25:32+00:00

Make the ACPI memory hotplug driver use struct acpi_scan_handler
for representing the object used to set up ACPI memory hotplug
functionality and to remove hotplug memory ranges and data
structures used by the driver before unregistering ACPI device
nodes representing memory.  Register the new struct acpi_scan_handler
object with the help of acpi_scan_add_handler_with_hotplug() to allow
user space to manipulate the attributes of the memory hotplug
profile.

This results in a significant reduction of the drvier's code size
and removes some ACPI hotplug code duplication.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Toshi Kani 
Tested-by: Toshi Kani

memory-hotplug: remove sysfs file of node

2013-02-24T01:50:13+00:00

Introduce a new function try_offline_node() to remove sysfs file of node
when all memory sections of this node are removed.  If some memory
sections of this node are not removed, this function does nothing.

Signed-off-by: Wen Congyang 
Signed-off-by: Tang Chen 
Cc: KOSAKI Motohiro 
Cc: Jiang Liu 
Cc: Jianguo Wu 
Cc: Kamezawa Hiroyuki 
Cc: Lai Jiangshan 
Cc: Wu Jianguo 
Cc: Yasuaki Ishimatsu 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds