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Subjectpci_pool_free from IRQ

Russel King complained that you might be calling pci_consistent_free
from an interrupt, which is unsafe on ARM. Why don't you remove this
part from pci_pool_free():

+ else if (!is_page_busy (pool->blocks_per_page, page->bitmap))
+ pool_free_page (pool, page);

In that case, fully free pages will stick about until the whole
pool is destroyed, which I think is not a big deal.

-- Pete
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