Change Details

--Remove NULL-checked dmamap macros. These are a minor pessimization on every configuration besides x86+bounce, as no other configuration allows NULL maps. arm64 originally allowed NULL maps, which seems to have been the motivaation behind adding arm[64]-specific memory barriers to bus_dma.h, but this was removed in r299463. --Remove sparc64 exception for dmamap function declarations, and implement the previous macros as functions in bus_machdep.c --Declare (optional) interface to MD implementation in bus_dma_internal.h

- Remove NULL-checked dmamap macros. These seem to be a minor pessimization on every configuration besides x86+bounce, as no other configuration allows NULL maps. arm64 originally allowed NULL maps, which seems to have been the motivation behind adding arm[64]-specific memory barriers to bus_dma.h, but this was removed in r299463. - Remove sparc64 exception for dmamap function declarations, and implement the previous macros as functions in bus_machdep.c - Declare (optional) interface to MD implementation in bus_dma_internal.h

--- Remove NULL-checked dmamap macros. These arseem to be a minor pessimization on everyon on every configuration besides x86+bounce, as no other configuration allows NULL maps. maps. arm64 originally allowed NULL maps, which seems to have been the motivaation behind adding arm[64]-specific memory barriers to bus_dma.h, but this was removed removed in r299463. --- Remove sparc64 exception for dmamap function declarations, and implement the previous macros as functions in bus_machdep.c --- Declare (optional) interface to MD implementation in bus_dma_internal.h