Re: [BK-2.5] Update arm implementation of DMA API to include GFP_

[James Bottomley]

[e-mail] said:
> Is this really safe?  Maybe ARM needs to use GFP_ATOMIC all the time
> for a specific reason, such as where and how it maps the cpu side
> mappings of the memory? 

According to Russell King, yes.

The PA-RISC one should also be correct.  Actually, to be honest, there's a 
longstanding issue in the pa-risc code where we can potentially allocate a 
page table using GFP_KERNEL in pci_alloc_consistent() when we obtain the 
mapping resources.  I can argue that we never go down this path in practice, 
but it does make GFP_ATOMIC allocations look unsafe on the platform.

James