On Fri, Apr 27, 2018 at 11:07:07AM -0500, Christopher Lameter wrote: > Well it looks like what we are using it for is to force allocation from > low physical memory if we fail to obtain proper memory through a normal > channel. The use of ZONE_DMA is only there for emergency purposes. > I think we could subsitute ZONE_DMA32 on x87 without a problem. > > Which means that ZONE_DMA has no purpose anymore. > > Can we make ZONE_DMA on x86 refer to the low 32 bit physical addresses > instead and remove ZONE_DMA32? While < 32-bit allocations are much more common there are plenty of requirements for < 24-bit or other weird masks still.
