[PATCH 0/2] xen: fix two issues in Xen pv qspinlock handling

[Juergen Gross]

The Xen specific queue spinlock wait function has two issues which
could result in a hanging system.

They have a similar root cause of clearing a pending wakeup of a
waiting vcpu and later going to sleep waiting for the just cleared
wakeup event, which of course won't ever happen.

Juergen Gross (2):
  xen: fix race in xen_qlock_wait()
  xen: make xen_qlock_wait() nestable

 arch/x86/xen/spinlock.c | 33 ++++++++++++---------------------
 1 file changed, 12 insertions(+), 21 deletions(-)

Cc: Waiman.Long@xxxxxx
Cc: peterz@xxxxxxxxxxxxx

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2.16.4