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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2010-03-15 00:35:03 -0400 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-17 18:43:47 -0700 |
| commit | bc32df00894f0e1dbf583cc3dab210d2969b078a (patch) | |
| tree | 1276c26359ac5c4cd231d1d61a4e9649971f4d35 /include/linux/memory.h | |
| parent | hpet: use for_each_set_bit() (diff) | |
| download | linux-dev-bc32df00894f0e1dbf583cc3dab210d2969b078a.tar.xz linux-dev-bc32df00894f0e1dbf583cc3dab210d2969b078a.zip | |
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>
Diffstat (limited to 'include/linux/memory.h')
| -rw-r--r-- | include/linux/memory.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h index 1adfe779eb99..85582e1bcee9 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -36,6 +36,8 @@ struct memory_block { struct sys_device sysdev; }; +int arch_get_memory_phys_device(unsigned long start_pfn); + /* These states are exposed to userspace as text strings in sysfs */ #define MEM_ONLINE (1<<0) /* exposed to userspace */ #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ |