[*] For information on bus mastering DMA and coherency please read:
Documentation/driver-api/pci/pci.rst
- Documentation/DMA-API-HOWTO.txt
- Documentation/DMA-API.txt
+ Documentation/core-api/dma-api-howto.rst
+ Documentation/core-api/dma-api.rst
DATA DEPENDENCY BARRIERS (HISTORICAL)
These are for use with atomic RMW functions that do not imply memory
barriers, but where the code needs a memory barrier. Examples for atomic
- RMW functions that do not imply are memory barrier are e.g. add,
+ RMW functions that do not imply a memory barrier are e.g. add,
subtract, (failed) conditional operations, _relaxed functions,
but not atomic_read or atomic_set. A common example where a memory
barrier may be required is when atomic ops are used for reference
here.
See the subsection "Kernel I/O barrier effects" for more information on
- relaxed I/O accessors and the Documentation/DMA-API.txt file for more
- information on consistent memory.
+ relaxed I/O accessors and the Documentation/core-api/dma-api.rst file for
+ more information on consistent memory.
(*) pmem_wmb();