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

>>> Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> 06/13/14 1:26 PM >>>
>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.

So patch 2 doesn't drop any acquire/release pair of a lock - was it a bug then
that the lock wasn't taken before?


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