[Xen-devel] [PATCH 0/2] xen/arm: make accesses to desc->status flags atomic

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

The IRQ line status flags are stored as bits in the status field of
struct irq_desc. Accesses to the status flags could be atomic but at the
moment they are not.

Make them atomic on ARM. This allows us to avoid taking the desc
lock when clearing the IRQ_INPROGRESS flag for irqs routed to the guest.


Stefano Stabellini (2):
      xen: introduce bit access macros for the IRQ line status flags
      xen/arm: make accesses to desc->status flags atomic

 xen/arch/arm/gic.c    |   10 +++++-----
 xen/arch/arm/irq.c    |   29 +++++++++++++++--------------
 xen/include/xen/irq.h |   24 ++++++++++++++++--------
 3 files changed, 36 insertions(+), 27 deletions(-)

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