memory hotplug: allow setting of phys_device
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Mon, 15 Mar 2010 04:35:03 +0000 (00:35 -0400)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 18 Mar 2010 01:43:47 +0000 (18:43 -0700)
commitbc32df00894f0e1dbf583cc3dab210d2969b078a
tree1276c26359ac5c4cd231d1d61a4e9649971f4d35
parente5d6151115aee73825c1752aff7cd09adfece839
memory hotplug: allow setting of phys_device

/sys/devices/system/memory/memoryX/phys_device is supposed to contain the
number of the physical device that the corresponding piece of memory
belongs to.

In case a physical device should be replaced or taken offline for whatever
reason it is necessary to set all corresponding memory pieces offline.
The current implementation always sets phys_device to '0' and there is no
way or hook to change that.  Seems like there was a plan to implement that
but it wasn't finished for whatever reason.

So add a weak function which architectures can override to actually set
the phys_device from within add_memory_block().

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/base/memory.c
include/linux/memory.h