Hi all, various architectures have used exact memory allocations for dma allocations for a long time, but x86 and thus the common code based on it kept using our normal power of two allocator, which tends to waste a lot of memory for certain allocations. Switching to a slightly cleaned up alloc_pages_exact is pretty easy, but it turns out that because we didn't filter valid gfp_t flags on the DMA allocator, a bunch of drivers were passing __GFP_COMP to it, which is rather bogus in too many ways to explain. Arm has been filtering it for a while, but this series instead tries to fix the drivers and warn when __GFP_COMP is passed, which makes it much larger than just adding the functionality.
