The patch titled
Subject: kdump: add udev events for memory online/offline
has been added to the -mm tree. Its filename is
kdump-add-udev-events-for-memory-online-offline.patch
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------------------------------------------------------
From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Subject: kdump: add udev events for memory online/offline
Currently no udev events for memory hotplug "online" and "offline" are
generated:
# udevadm monitor
# echo offline > /sys/devices/system/memory/memory4/state
==> No event
When kdump is loaded, kexec detects the current memory configuration and
stores it in the pre-allocated ELF core header. Therefore, for kdump it
is necessary to reload the kdump kernel with kexec when the memory
configuration changes (e.g. for online/offline hotplug memory).
In order to do this automatically, udev rules should be used. This kernel
patch adds udev events for "online" and "offline". Together with this
kernel patch, the following udev rules for online/offline have to be added
to "/etc/udev/rules.d/98-kexec.rules":
SUBSYSTEM=="memory", ACTION=="online", PROGRAM="/etc/init.d/kdump restart"
SUBSYSTEM=="memory", ACTION=="offline", PROGRAM="/etc/init.d/kdump restart"
Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Dave Hansen <haveblue@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/memory.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff -puN drivers/base/memory.c~kdump-add-udev-events-for-memory-online-offline drivers/base/memory.c
--- a/drivers/base/memory.c~kdump-add-udev-events-for-memory-online-offline
+++ a/drivers/base/memory.c
@@ -313,11 +313,22 @@ static int memory_block_change_state(str
ret = memory_block_action(mem->start_section_nr, to_state);
- if (ret)
+ if (ret) {
mem->state = from_state_req;
- else
- mem->state = to_state;
+ goto out;
+ }
+ mem->state = to_state;
+ switch (mem->state) {
+ case MEM_OFFLINE:
+ kobject_uevent(&mem->sysdev.kobj, KOBJ_OFFLINE);
+ break;
+ case MEM_ONLINE:
+ kobject_uevent(&mem->sysdev.kobj, KOBJ_ONLINE);
+ break;
+ default:
+ break;
+ }
out:
mutex_unlock(&mem->state_mutex);
return ret;
_
Subject: Subject: kdump: add udev events for memory online/offline
Patches currently in -mm which might be from holzheu@xxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
kdump-add-missing-ram-resource-in-crash_shrink_memory.patch
kdump-fix-crash_kexec-smp_send_stop-race-in-panic.patch
kdump-add-udev-events-for-memory-online-offline.patch
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