[PATCH 1/3] powerpc - Initialize the irq radix tree earlier
Benjamin Herrenschmidt
benh at kernel.crashing.org
Tue Aug 5 11:05:03 EST 2008
> - Remove the populating of the tree from the revmap function as
> you already do
> - Move it to irq_create_mapping() for the normal case
> - For pre-existing interrupt, have the generic code that initializes
> the radix tree walk through all interrupts and setup the revmap for
> them. If that needs locking vs. concurrent irq_create_mapping, it's
> easy to use one of the available spinlocks for that.
And in fact, you may even be able to avoid GFP_ATOMIC completely here
and switch it to GFP_KERNEL since irq_create_mapping() can sleep afaik,
provided that you avoid the spinlocking.
Ben.
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