[PATCH v2 RESEND 0/4] Drivers: hv: balloon: fix WS2012 memory hotplug issues and do some cleanup

[Vitaly Kuznetsov <vkuznets@redhat.com>]

Changes since v2:
- I'm sorry, I screwed up Alex's address, this is just a resend.

Changes since v1:
- Keep ol_waitevent and wait when kernel memory onlining is disabled [Alex Ng]

Crashes with Hyper-V balloon driver are reported with WS2012 (non-R2),
hosts I was able to identify two issues which I fix with first two patches
of this series. Patches 3 removes wait on ol_waitevent when we have in
in-kernel memory onlining, patch 4 gets rid of ha_region_mutex by doing
the locking fine-grained with a spinlock.

Vitaly Kuznetsov (4):
  Drivers: hv: balloon: keep track of where ha_region starts
  Drivers: hv: balloon: account for gaps in hot add regions
  Drivers: hv: balloon: don't wait for ol_waitevent when
    memhp_auto_online is enabled
  Drivers: hv: balloon: replace ha_region_mutex with spinlock

 drivers/hv/hv_balloon.c | 216 ++++++++++++++++++++++++++++++++----------------
 1 file changed, 144 insertions(+), 72 deletions(-)

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2.7.4