Hi! Current PPC implementation of consistent_alloc cannot be called from an interrupt context. This function is used by pci_alloc_consistent when CONFIG_NOT_COHERENT_CACHE is defined.
Unfortunately it contradicts Documentation/DMA-mapping.txt which clearly states that pci_alloc_consistent can be called from an interrupt context, and some drivers breaks under PPC because of it. The only part of consistent_alloc that may sleep is a call to get_vm_area. I did quick (and dirty) fix for this problem. I reserved a virtual address space of a reasonable size (16M), and later just use some part of it for real page allocations when called from interrupt context. No deallocation support :( though Correct implementation will require something like stuff from vmaloc.c and it seems like a lot of code duplication to me. So, my question to "big guys" here :), is there a better way to implement this? Thanks, Eugene Surovegin <mailto:ebs at innocent.com> ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
