dma-debug: driver filter

Hi,

this small patchset adds a new feature to dma-api debugging: a driver
filter. A driver developer can write the name of his driver to
dma-api/driver_filter and the kernel will then only print errors
produced by this driver. This is useful if other drivers in the system
also have bugs. In this case the driver developer can limit the bug
output to messages interesting for him.

Joerg

diffstat:

 Documentation/DMA-API.txt |   11 +++
 lib/dma-debug.c           |  157 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 167 insertions(+), 1 deletions(-)

shortlog:

Joerg Roedel (4):
      dma-debug: add variables and checks for driver filter
      dma-debug: add debugfs file for driver filter
      dma-debug: add dma_debug_driver kernel command line
      dma-debug: add documentation for the driver filter