kernel-packages team mailing list archive

[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Please don't apply this udev rule as it is:

 * It can be made *much* more efficient and avoid an extra shell with
 
     SUBSYSTEM=="memory", ACTION=="add", DEVPATH=="/devices/system/memory/memory*[0-9]", ATTR{online}="1"

   (same for the other rule)

 * In this generic way they don't look plausible. If we *always* want
hotplugged CPUs and memory to be online (which sounds plausible), then
the kernel should do just that. It shouldn't require lots of extra
userspace overhead to always set a driver attribute to a constant value.
It is certainly ok as a workaround until the kernel gets fixed properly,
though.

 * If this applies to Hyper-V only, it would be better to surround these
rules with some check if the system is actually running on this
hypervisor. This might happen via DMI data (like
ATTR{[dmi/id]product_version}=="hyper-v"), the presence of a Hyper-V
specific device/subsystem in sysfs, and so on. This
ATTR{[subsystem/device]attribute} syntax works generically by the way,
so that you can look at a device different than the one you are
currently selecting.

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https://bugs.launchpad.net/bugs/1233466

Title:
  Hot-Add Memory failing for lack of udev rule

Status in “linux” package in Ubuntu:
  Fix Released
Status in “systemd” package in Ubuntu:
  In Progress

Bug description:
  It appears that the Hot-Add mechanism is not working because of lack
  of a udev rule. The required rule is attached to this bug. Please
  include it.

  Furthermore, please ensure that the following patches are included:

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=20138d6cb838aa01bb1b382dcb5f3d3a119ff2cb

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=c5e2254f8d63a6654149aa32ac5f2b7dd66a976d

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=ed07ec93e83ec471d365ce084e43ad90fd205903

  The above patches should be in but just wanted to ensure that you guys
  got these.

  Thanks again for the great last minute help.
  Abhishek

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