[PATCH] fix kmemleak complaining about memory leaks when offlining/onlining vCPUS (v1).

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

When I fixed the online/offline vCPU mechanism to work again under
PVHVM guests, I saw this:


[  665.026885] kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

but due to not having enough time did not fix it. This patchset
fixes it by stashing the 'char *' of said interrupts line during their
creation. When they are torn down when a VCPU is offline we use said
per-cpu pointer to free it.

As part of it I also added some error checking and some default values.
Please look.

 arch/x86/xen/smp.c      | 91 ++++++++++++++++++++++++++++++++-----------------
 arch/x86/xen/spinlock.c |  5 +++
 arch/x86/xen/time.c     | 41 +++++++++++++++-------
 3 files changed, 92 insertions(+), 45 deletions(-)

Konrad Rzeszutek Wilk (9):
      xen/smp: Coalesce the free_irq calls in one function.
      xen/smp: Introduce a common structure to contain the IRQ name and interrupt line.
      xen/smp: Set the per-cpu IRQ number to a valid default.
      xen/smp: Don't leak interrupt name when offlining.
      xen/spinlock: Don't leak interrupt name when offlining.
      xen/time: Encapsulate the struct clock_event_device in another structure.
      xen/time: Don't leak interrupt name when offlining.
      xen/time: Check that the per_cpu data structure has data before freeing.
      xen/time: Free onlined per-cpu data structure if we want to online it again.